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 Fundamental Investors
|
|
| Entity Central Index Key |
0000039473
|
|
| Entity Investment Company Type |
N-1A
|
|
| Document Period End Date |
Jun. 30, 2026
|
|
| Fundamental Investors Class A - ANCFX |
|
|
| Shareholder Report [Line Items] |
|
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| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class A
|
|
| Trading Symbol |
ANCFX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-A. 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/mutual-fund-literature-A
|
|
| 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 A | $ 30 | 0.56 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 30
|
|
| Expense Ratio, Percent |
0.56%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class C - AFICX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class C
|
|
| Trading Symbol |
AFICX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-C. 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/mutual-fund-literature-C
|
|
| 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 C | $ 70 | 1.31 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 70
|
|
| Expense Ratio, Percent |
1.31%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
| Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class F-1 - AFIFX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class F-1
|
|
| Trading Symbol |
AFIFX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-F1. 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/mutual-fund-literature-F1
|
|
| 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 F-1 | $ 34 | 0.64 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 34
|
|
| Expense Ratio, Percent |
0.64%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class F-2 - FINFX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class F-2
|
|
| Trading Symbol |
FINFX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-F2. 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/mutual-fund-literature-F2
|
|
| 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 F-2 | $ 21 | 0.39 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 21
|
|
| Expense Ratio, Percent |
0.39%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class F-3 - FUNFX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class F-3
|
|
| Trading Symbol |
FUNFX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-F3. 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/mutual-fund-literature-F3
|
|
| 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 F-3 | $ 15 | 0.28 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 15
|
|
| Expense Ratio, Percent |
0.28%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class 529-A - CFNAX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class 529-A
|
|
| Trading Symbol |
CFNAX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-529A. 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/mutual-fund-literature-529A
|
|
| 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 529-A | $ 32 | 0.60 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 32
|
|
| Expense Ratio, Percent |
0.60%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class 529-C - CFNCX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class 529-C
|
|
| Trading Symbol |
CFNCX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-529C. 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/mutual-fund-literature-529C
|
|
| 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 529-C | $ 73 | 1.38 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 73
|
|
| Expense Ratio, Percent |
1.38%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class 529-E - CFNEX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class 529-E
|
|
| Trading Symbol |
CFNEX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-529E. 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/mutual-fund-literature-529E
|
|
| 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 529-E | $ 45 | 0.85 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 45
|
|
| Expense Ratio, Percent |
0.85%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class 529-F-2 - FFXFX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class 529-F-2
|
|
| Trading Symbol |
FFXFX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-529F2. 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/mutual-fund-literature-529F2
|
|
| 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 529-F-2 | $ 20 | 0.37 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 20
|
|
| Expense Ratio, Percent |
0.37%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class 529-F-3 - FEEFX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class 529-F-3
|
|
| Trading Symbol |
FEEFX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-529F3. 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/mutual-fund-literature-529F3
|
|
| 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 529-F-3 | $ 18 | 0.33 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 18
|
|
| Expense Ratio, Percent |
0.33%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class R-1 - RFNAX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class R-1
|
|
| Trading Symbol |
RFNAX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-R1. 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/mutual-fund-literature-R1
|
|
| 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 R-1 | $ 72 | 1.36 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 72
|
|
| Expense Ratio, Percent |
1.36%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class R-2 - RFNBX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class R-2
|
|
| Trading Symbol |
RFNBX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-R2. 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/mutual-fund-literature-R2
|
|
| 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 R-2 | $ 73 | 1.37 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 73
|
|
| Expense Ratio, Percent |
1.37%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class R-2E - RFEBX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class R-2E
|
|
| Trading Symbol |
RFEBX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-R2E. 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/mutual-fund-literature-R2E
|
|
| 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 R-2E | $ 57 | 1.08 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 57
|
|
| Expense Ratio, Percent |
1.08%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class R-3 - RFNCX |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
|
|
| Class Name |
Class R-3
|
|
| Trading Symbol |
RFNCX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-R3. 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/mutual-fund-literature-R3
|
|
| 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 R-3 | $ 49 | 0.92 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 49
|
|
| Expense Ratio, Percent |
0.92%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class R-4 - RFNEX |
|
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| Shareholder Report [Line Items] |
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| Fund Name |
Fundamental Investors®
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| Class Name |
Class R-4
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| Trading Symbol |
RFNEX
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| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2026 to June 30, 2026.
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| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
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| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R4. You can also request this information by contacting us at (800) 421-4225.
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| Additional Information Phone Number |
(800) 421-4225
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| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R4
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| 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 R-4 | $ 34 | 0.63 % * |
*Annualized.
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| Expenses Paid, Amount |
$ 34
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| Expense Ratio, Percent |
0.63%
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[1] |
| Net Assets |
$ 181,206,000,000
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| Holdings Count | Holding |
244
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| Investment Company, Portfolio Turnover |
27.00%
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| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
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| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
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| Fundamental Investors Class R-5E - RFNHX |
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| Shareholder Report [Line Items] |
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| Fund Name |
Fundamental Investors®
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| Class Name |
Class R-5E
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| Trading Symbol |
RFNHX
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|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-R5E. You can also request this information by contacting us at (800) 421-4225.
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| Additional Information Phone Number |
(800) 421-4225
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| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R5E
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| 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 R-5E | $ 22 | 0.42 % * |
*Annualized.
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| Expenses Paid, Amount |
$ 22
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| Expense Ratio, Percent |
0.42%
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[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class R-5 - RFNFX |
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|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
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| Class Name |
Class R-5
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| Trading Symbol |
RFNFX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-R5. You can also request this information by contacting us at (800) 421-4225.
|
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| Additional Information Phone Number |
(800) 421-4225
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|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R5
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|
| 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 R-5 | $ 18 | 0.33 % * |
*Annualized.
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| Expenses Paid, Amount |
$ 18
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| Expense Ratio, Percent |
0.33%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| Fundamental Investors Class R-6 - RFNGX |
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|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Fundamental Investors®
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| Class Name |
Class R-6
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| Trading Symbol |
RFNGX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Fundamental Investors (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/mutual-fund-literature-R6. 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/mutual-fund-literature-R6
|
|
| 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 R-6 | $ 15 | 0.28 % * |
*Annualized.
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| Expenses Paid, Amount |
$ 15
|
|
| Expense Ratio, Percent |
0.28%
|
[1] |
| Net Assets |
$ 181,206,000,000
|
|
| Holdings Count | Holding |
244
|
|
| Investment Company, Portfolio Turnover |
27.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 181,206 | | Total number of portfolio holdings | 244 | | Portfolio turnover rate | 27 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
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