v3.26.1
Shareholder Report
6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name American Funds Insurance Series
Entity Central Index Key 0000729528
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
American Funds Global Growth Portfolio - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® Global Growth Portfolio
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds Global Growth Portfolio (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000
investment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 4
$
27
0.51
%
*
*Annualized.
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.51% [1]
Net Assets $ 89,000,000
Holdings Count | Holding 6
Investment Company, Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
89
Total number of portfolio holdings6
Portfolio turnover rate7
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Growth funds80.31
%
Growth-and-income funds19.77
%
Other assets less liabilities(0.08
)
%
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was
appointed
as
the
fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds Growth and Income Portfolio - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® Growth and Income Portfolio
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds Growth and Income Portfolio (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000
investment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 4
$
26
0.51
%
*
*Annualized.
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.51% [1]
Net Assets $ 450,000,000
Holdings Count | Holding 8
Investment Company, Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
450
Total number of portfolio holdings8
Portfolio turnover rate7
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Growth-and-income funds40.18
%
Fixed income funds29.83
%
Growth funds10.07
%
Equity-income funds9.98
%
Asset allocation funds5.02
Balanced funds5.00
%
Other assets less liabilities(0.08
)
%
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was
appointed
as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds Managed Risk Growth Portfolio - Class P2  
Shareholder Report [Line Items]  
Fund Name American Funds® Managed Risk Growth Portfolio
Class Name Class P2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds Managed Risk Growth Portfolio (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-P2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-P2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class P2
$
31
0.61
%
*
*Annualized.
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.61% [1]
Net Assets $ 1,791,623,000
Holdings Count | Holding 25
Investment Company, Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in thousands)
$
1,791,623
Total number of portfolio holdings25
Portfolio turnover rate18
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Includes derivatives.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds Managed Risk Growth and Income Portfolio - Class P2  
Shareholder Report [Line Items]  
Fund Name American Funds® Managed Risk Growth and Income Portfolio
Class Name Class P2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds Managed Risk Growth and Income Portfolio (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-P2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-P2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000
investment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class P2
$
31
0.61
%
*
*Annualized.
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.61% [1]
Net Assets $ 1,310,595,000
Holdings Count | Holding 24
Investment Company, Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in thousands)
$
1,310,595
Total number of portfolio holdings24
Portfolio turnover rate16
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Includes derivatives.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the
independent
trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds Managed Risk Global Allocation Portfolio - Class P2  
Shareholder Report [Line Items]  
Fund Name American Funds® Managed Risk Global Allocation Portfolio
Class Name Class P2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds Managed Risk Global Allocation Portfolio (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-P2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-P2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class P2
$
33
0.63
%
*
*Annualized.
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.63% [1]
Net Assets $ 357,545,000
Holdings Count | Holding 18
Investment Company, Portfolio Turnover 17.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in thousands)
$
357,545
Total number of portfolio holdings18
Portfolio turnover rate17
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Includes derivatives.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2070 Target Date Retirement Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2070 Target Date Retirement Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2070 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000
investment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$
3
0.06
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.06% [1]
Net Assets $ 2,000,000
Holdings Count | Holding 17
Investment Company, Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
2
Total number of portfolio holdings17
Portfolio turnover rate5
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025,
PricewaterhouseCoopers
LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the period May 1, 2024 (commencement of operations) through December 31, 2024, fiscal year ended December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2070 Target Date Retirement Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2070 Target Date Retirement Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2070 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1A
$
3
0.05
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [1]
Net Assets $ 2,000,000
Holdings Count | Holding 17
Investment Company, Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
2
Total number of portfolio holdings17
Portfolio turnover rate5
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee,
as
part of a broader effort to update board oversight and fund operations. At no point during the period May 1, 2024 (commencement of operations) through December 31, 2024, fiscal year ended December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2070 Target Date Retirement Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2070 Target Date Retirement Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2070 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 2
$
3
0.06
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.06% [1]
Net Assets $ 2,000,000
Holdings Count | Holding 17
Investment Company, Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
2
Total number of portfolio holdings17
Portfolio turnover rate5
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The
change
in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the period May 1, 2024 (commencement of operations) through December 31, 2024, fiscal year ended December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2070 Target Date Retirement Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2070 Target Date Retirement Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2070 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 4
$
3
0.05
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [1]
Net Assets $ 2,000,000
Holdings Count | Holding 17
Investment Company, Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
2
Total number of portfolio holdings17
Portfolio turnover rate5
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as
the
fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the period May 1, 2024 (commencement of operations) through December 31, 2024, fiscal year ended December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2065 Target Date Retirement Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2065 Target Date Retirement Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2065 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$
3
0.06
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.06% [1]
Net Assets $ 698,000
Holdings Count | Holding 17
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in thousands)
$
698
Total number of portfolio holdings17
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2065 Target Date Retirement Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2065 Target Date Retirement Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2065 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1A
$
3
0.05
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [1]
Net Assets $ 698,000
Holdings Count | Holding 17
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in thousands)
$
698
Total number of portfolio holdings17
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2065 Target Date Retirement Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2065 Target Date Retirement Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2065 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000
investment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 2
$
3
0.05
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [1]
Net Assets $ 698,000
Holdings Count | Holding 17
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in thousands)
$
698
Total number of portfolio holdings17
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2065 Target Date Retirement Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2065 Target Date Retirement Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2065 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 4
$
8
0.16
%
*
*Annualized.
Expenses Paid, Amount $ 8
Expense Ratio, Percent 0.16% [1]
Net Assets $ 698,000
Holdings Count | Holding 17
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in thousands)
$
698
Total number of portfolio holdings17
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2060 Target Date Retirement Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2060 Target Date Retirement Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2060 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$
3
0.06
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.06% [1]
Net Assets $ 1,000,000
Holdings Count | Holding 18
Investment Company, Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
1
Total number of portfolio holdings18
Portfolio turnover rate6
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2060 Target Date Retirement Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2060 Target Date Retirement Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2060 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1A
$
3
0.05
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [1]
Net Assets $ 1,000,000
Holdings Count | Holding 18
Investment Company, Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
1
Total number of portfolio holdings18
Portfolio turnover rate6
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2060 Target Date Retirement Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2060 Target Date Retirement Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2060 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 2
$
3
0.05
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [1]
Net Assets $ 1,000,000
Holdings Count | Holding 18
Investment Company, Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
1
Total number of portfolio holdings18
Portfolio turnover rate6
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2060 Target Date Retirement Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2060 Target Date Retirement Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2060 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 4
$
15
0.28
%
*
*Annualized.
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.28% [1]
Net Assets $ 1,000,000
Holdings Count | Holding 18
Investment Company, Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
1
Total number of portfolio holdings18
Portfolio turnover rate6
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2055 Target Date Retirement Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2055 Target Date Retirement Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2055 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 10,000,000
Holdings Count | Holding 20
Investment Company, Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
10
Total number of portfolio holdings20
Portfolio turnover rate16
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2055 Target Date Retirement Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2055 Target Date Retirement Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2055 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1A
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 10,000,000
Holdings Count | Holding 20
Investment Company, Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
10
Total number of portfolio holdings20
Portfolio turnover rate16
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2055 Target Date Retirement Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2055 Target Date Retirement Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2055 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 2
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 10,000,000
Holdings Count | Holding 20
Investment Company, Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
10
Total number of portfolio holdings20
Portfolio turnover rate16
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2055 Target Date Retirement Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2055 Target Date Retirement Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2055 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 4
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 10,000,000
Holdings Count | Holding 20
Investment Company, Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
10
Total number of portfolio holdings20
Portfolio turnover rate16
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2050 Target Date Retirement Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2050 Target Date Retirement Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2050 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 15,000,000
Holdings Count | Holding 20
Investment Company, Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
15
Total number of portfolio holdings20
Portfolio turnover rate10
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2050 Target Date Retirement Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2050 Target Date Retirement Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2050 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1A
$
2
0.03
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03% [1]
Net Assets $ 15,000,000
Holdings Count | Holding 20
Investment Company, Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
15
Total number of portfolio holdings20
Portfolio turnover rate10
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2050 Target Date Retirement Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2050 Target Date Retirement Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2050 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 2
$
2
0.03
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03% [1]
Net Assets $ 15,000,000
Holdings Count | Holding 20
Investment Company, Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
15
Total number of portfolio holdings20
Portfolio turnover rate10
%
Holdings [Text Block]
Portfolio holdings by fund type
(pe
rc
ent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2050 Target Date Retirement Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2050 Target Date Retirement Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2050 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 4
$
8
0.15
%
*
*Annualized.
Expenses Paid, Amount $ 8
Expense Ratio, Percent 0.15% [1]
Net Assets $ 15,000,000
Holdings Count | Holding 20
Investment Company, Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
15
Total number of portfolio holdings20
Portfolio turnover rate10
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2045 Target Date Retirement Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2045 Target Date Retirement Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2045 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1
$
3
0.05
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [1]
Net Assets $ 21,000,000
Holdings Count | Holding 25
Investment Company, Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
21
Total number of portfolio holdings25
Portfolio turnover rate23
%
Holdings [Text Block]
Portfolio holdin
gs by
fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2045 Target Date Retirement Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2045 Target Date Retirement Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2045 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1A
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 21,000,000
Holdings Count | Holding 25
Investment Company, Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
21
Total number of portfolio holdings25
Portfolio turnover rate23
%
Holdings [Text Block]
Portfolio hold
ings
by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2045 Target Date Retirement Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2045 Target Date Retirement Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2045 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 2
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 21,000,000
Holdings Count | Holding 25
Investment Company, Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
21
Total number of portfolio holdings25
Portfolio turnover rate23
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent
of ne
t assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2045 Target Date Retirement Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2045 Target Date Retirement Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2045 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 4
$
7
0.13
%
*
*Annualized.
Expenses Paid, Amount $ 7
Expense Ratio, Percent 0.13% [1]
Net Assets $ 21,000,000
Holdings Count | Holding 25
Investment Company, Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
21
Total number of portfolio holdings25
Portfolio turnover rate23
%
Holdings [Text Block]
Portfolio holdings by
fund t
ype
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2040 Target Date Retirement Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2040 Target Date Retirement Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2040 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1
$
4
0.07
%
*
*Annualized.
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.07% [1]
Net Assets $ 23,000,000
Holdings Count | Holding 26
Investment Company, Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key fund statist
ic
s
Fund net assets (in millions)
$
23
Total number of portfolio holdings26
Portfolio turnover rate16
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2040 Target Date Retirement Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2040 Target Date Retirement Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2040 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1A
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 23,000,000
Holdings Count | Holding 26
Investment Company, Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
23
Total number of portfolio holdings26
Portfolio turnover rate16
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagre
emen
ts with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2040 Target Date Retirement Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2040 Target Date Retirement Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2040 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 invest
me
nt)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 2
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 23,000,000
Holdings Count | Holding 26
Investment Company, Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
23
Total number of portfolio holdings26
Portfolio turnover rate16
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2040 Target Date Retirement Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2040 Target Date Retirement Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2040 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 4
$
28
0.54
%
*
*Annualized.
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.54% [1]
Net Assets $ 23,000,000
Holdings Count | Holding 26
Investment Company, Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
23
Total number of portfolio holdings26
Portfolio turnover rate16
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements w
ith a
ccountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2035 Target Date Retirement Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2035 Target Date Retirement Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2035 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,0
0
0 inve
stm
ent)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1
$
3
0.05
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [1]
Net Assets $ 40,000,000
Holdings Count | Holding 24
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
40
Total number of portfolio holdings24
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2035 Target Date Retirement Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2035 Target Date Retirement Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2035 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $1
0,000 in
vest
men
t)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1A
$
1
0.02
%
*
*Annualized.
Expenses Paid, Amount $ 1
Expense Ratio, Percent 0.02% [1]
Net Assets $ 40,000,000
Holdings Count | Holding 24
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
40
Total number of portfolio holdings24
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2035 Target Date Retirement Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2035 Target Date Retirement Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2035 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 2
$
1
0.02
%
*
*Annualized.
Expenses Paid, Amount $ 1
Expense Ratio, Percent 0.02% [1]
Net Assets $ 40,000,000
Holdings Count | Holding 24
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
40
Total number of portfolio holdings24
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements
with
accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2035 Target Date Retirement Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2035 Target Date Retirement Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2035 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypoth
etica
l $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 4
$
26
0.51
%
*
*Annualized.
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.51% [1]
Net Assets $ 40,000,000
Holdings Count | Holding 24
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
40
Total number of portfolio holdings24
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2030 Target Date Retirement Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2030 Target Date Retirement Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2030 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1
$
3
0.06
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.06% [1]
Net Assets $ 47,000,000
Holdings Count | Holding 25
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
47
Total number of portfolio holdings25
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2030 Target Date Retirement Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2030 Target Date Retirement Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2030 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1A
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 47,000,000
Holdings Count | Holding 25
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
47
Total number of portfolio holdings25
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2030 Target Date Retirement Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2030 Target Date Retirement Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2030 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 2
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 47,000,000
Holdings Count | Holding 25
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
47
Total number of portfolio holdings25
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2030 Target Date Retirement Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2030 Target Date Retirement Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2030 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 4
$
27
0.53
%
*
*Annualized.
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.53% [1]
Net Assets $ 47,000,000
Holdings Count | Holding 25
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
47
Total number of portfolio holdings25
Portfolio turnover rate12
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2025 Target Date Retirement Income Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2025 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$
3
0.06
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.06% [1]
Net Assets $ 26,000,000
Holdings Count | Holding 21
Investment Company, Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
26
Total number of portfolio holdings21
Portfolio turnover rate15
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2025 Target Date Retirement Income Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2025 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1A
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 26,000,000
Holdings Count | Holding 21
Investment Company, Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
26
Total number of portfolio holdings21
Portfolio turnover rate15
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2025 Target Date Retirement Income Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2025 Target Date Retirement Income Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2025 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 2
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 26,000,000
Holdings Count | Holding 21
Investment Company, Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
26
Total number of portfolio holdings21
Portfolio turnover rate15
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Graphical Representation - Allocation 1 Chart
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2025 Target Date Retirement Income Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2025 Target Date Retirement Income Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2025 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund atcapitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 4
$
27
0.54
%
*
*Annualized.
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.54% [1]
Net Assets $ 26,000,000
Holdings Count | Holding 21
Investment Company, Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
26
Total number of portfolio holdings 21
Portfolio turnover rate 15
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
*Less than 0.01%.
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025
, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2020 Target Date Retirement Income Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2020 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1
$
3
0.06
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.06% [1]
Net Assets $ 41,000,000
Holdings Count | Holding 21
Investment Company, Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
Key fund sta
ti
stics
Fund net assets (in millions)
$
41
Total number of portfolio holdings21
Portfolio turnover rate8
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Fixed income funds46.36
%
Growth-and-income funds21.41
%
Equity-income funds18.65
%
Balanced funds11.68
%
Growth funds1.94
Other assets less liabilities(0.04
)
%
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2020 Target Date Retirement Income Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2020 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(b
as
ed on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage o
f a $10,0
00 investment
Class 1A
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 41,000,000
Holdings Count | Holding 21
Investment Company, Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
41
Total number of portfolio holdings21
Portfolio turnover rate8
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Fixed income funds46.36
%
Growth-and-income funds21.41
%
Equity-income funds18.65
%
Balanced funds11.68
%
Growth funds1.94
Other assets less liabilities(0.04
)
%
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2020 Target Date Retirement Income Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2020 Target Date Retirement Income Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2020 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 2
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 41,000,000
Holdings Count | Holding 21
Investment Company, Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
41
Total number of portfolio holdings21
Portfolio turnover rate8
%
Holdings [Text Block]
Portfolio holdings by fund
ty
pe
(percent of net assets)
Fixed income funds46.36
%
Growth-and-income funds21.41
%
Equity-income funds18.65
%
Balanced funds11.68
%
Growth funds1.94
Other assets less liabilities(0.04
)
%
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2020 Target Date Retirement Income Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2020 Target Date Retirement Income Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2020 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 4
$
28
0.55
%
*
*Annualized.
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.55% [1]
Net Assets $ 41,000,000
Holdings Count | Holding 21
Investment Company, Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
41
Total number of portfolio holdings21
Portfolio turnover rate8
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Fixed income funds46.36
%
Growth-and-income funds21.41
%
Equity-income funds18.65
%
Balanced funds11.68
%
Growth funds1.94
Other assets less liabilities(0.04
)
%
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements wit
h acco
untants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2015 Target Date Retirement Income Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2015 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund atcapitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1
$
3
0.05
%
*
*Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [1]
Net Assets $ 144,000,000
Holdings Count | Holding 18
Investment Company, Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
144
Total number of portfolio holdings
18
Portfolio turnover rate7
%
Holdings [Text Block]
Portfolio holdings by fund type
Fixed income funds49.70
%
Equity-income funds20.90
%
Growth-and-income funds18.99
%
Balanced funds10.49
%
Other assets less liabilities(0.08
)
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, P
ricewaterhou
seCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the
fund’s
independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2015 Target Date Retirement Income Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2015 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund atcapitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1A
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 144,000,000
Holdings Count | Holding 18
Investment Company, Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
144
Total number of portfolio holdings18
Portfolio turnover rate7
%
Holdings [Text Block]
Portfolio holdings by fund type
Fixed income funds49.70
%
Equity-income funds20.90
%
Growth-and-income funds18.99
%
Balanced funds10.49
%
Other assets less liabilities(0.08
)
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with ac
cou
ntants
On December 10, 2025, P
ricewaterhouseCoope
rs LLP (“PwC”) was dismissed and Deloitte & To
uche LLP
was
appointed as the fund’s independent registered public accounting firm for the
fiscal yea
r ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds® IS 2015 Target Date Retirement Income Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2015 Target Date Retirement Income Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2015 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 2
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 144,000,000
Holdings Count 18
Investment Company, Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
144
Total number of portfolio holdings18
Portfolio turnover rate7
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Fixed income funds49.70
%
Equity-income funds20.90
%
Growth-and-income funds18.99
%
Balanced funds10.49
%
Other assets less liabilities(0.08
)
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2015 Target Date Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2015 Target Date Retirement Income Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2015 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 4
$
28
0.55
%
*
*Annualized.
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.55% [1]
Net Assets $ 144,000,000
Holdings Count | Holding 18
Investment Company, Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
144
Total number of portfolio holdings18
Portfolio turnover rate7
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Fixed income funds49.70
%
Equity-income funds20.90
%
Growth-and-income funds18.99
%
Balanced funds10.49
%
Other assets less liabilities(0.08
)
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2010 Target Date Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2010 Target Date Retirement Income Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2010 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-1. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 538,000,000
Holdings Count | Holding 16
Investment Company, Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
538
Total number of portfolio holdings16
Portfolio turnover rate4
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Fixed income funds51.76
%
Equity-income funds25.26
%
Growth-and-income funds14.77
%
Balanced funds8.29
%
Other assets less liabilities(0.08
)
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2010 Target Date Retirement Income Fund - Class 1A  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2010 Target Date Retirement Income Fund
Class Name Class 1A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2010 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional informationabout the fund at capitalgroup.com/AFIS-literature-1A. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-1A
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 1A
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 538,000,000
Holdings Count | Holding 16
Investment Company, Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
538
Total number of portfolio holdings16
Portfolio turnover rate4
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Fixed income funds51.76
%
Equity-income funds25.26
%
Growth-and-income funds14.77
%
Balanced funds8.29
%
Other assets less liabilities(0.08
)
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2010 Target Date Retirement Income Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2010 Target Date Retirement Income Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2010 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-2. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-2
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 2
$
2
0.04
%
*
*Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [1]
Net Assets $ 538,000,000
Holdings Count | Holding 16
Investment Company, Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
538
Total number of portfolio holdings16
Portfolio turnover rate4
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Fixed income funds51.76
%
Equity-income funds25.26
%
Growth-and-income funds14.77
%
Balanced funds8.29
%
Other assets less liabilities(0.08
)
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during
the
fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
American Funds IS 2010 Target Date Retirement Income Fund - Class 4  
Shareholder Report [Line Items]  
Fund Name American Funds® IS 2010 Target Date Retirement Income Fund
Class Name Class 4
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Funds IS 2010 Target Date Fund (the "fund") for the period from January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at capitalgroup.com/AFIS-literature-4. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/AFIS-literature-4
Expenses [Text Block]
What were the fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share classCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class 4
$
27
0.53
%
*
*Annualized.
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.53% [1]
Net Assets $ 538,000,000
Holdings Count | Holding 16
Investment Company, Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
538
Total number of portfolio holdings16
Portfolio turnover rate4
%
Holdings [Text Block]
Portfolio holdings by fund type
(percent of net assets)
Fixed income funds51.76
%
Equity-income funds25.26
%
Growth-and-income funds14.77
%
Balanced funds8.29
%
Other assets less liabilities(0.08
)
Total100.00
%
Accountant Change Date Dec. 10, 2025
Accountant Change Disagreements [Text Block]
Changes in and disagreements with accountants
On December 10, 2025, PricewaterhouseCoopers LLP (“PwC”) was dismissed and Deloitte & Touche LLP was appointed as the fund’s independent registered public accounting firm for the fiscal year ending December 31, 2026 audit. The change in the fund’s independent registered public accounting firm was approved by the fund’s board of trustees, including a majority of the independent trustees, upon recommendation of the audit committee, as part of a broader effort to update board oversight and fund operations. At no point during the fund’s fiscal years ended December 31, 2024 and December 31, 2025 and the subsequent interim period through February 13, 2026, were there any disagreements between management and PwC on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure.
[1] Annualized.