v3.26.1
Shareholder Report, Holdings (Details)
Jun. 30, 2026
American Funds Global Growth Portfolio - Class 4  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds Global Growth Portfolio - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 80.31%
American Funds Global Growth Portfolio - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.77%
American Funds Global Growth Portfolio - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.08%)
American Funds Growth and Income Portfolio - Class 4  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds Growth and Income Portfolio - Class 4 | Asset allocation funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
American Funds Growth and Income Portfolio - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.07%
American Funds Growth and Income Portfolio - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 29.83%
American Funds Growth and Income Portfolio - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.98%
American Funds Growth and Income Portfolio - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 40.18%
American Funds Growth and Income Portfolio - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds Growth and Income Portfolio - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.08%)
American Funds Managed Risk Growth Portfolio - Class P2 | Options purchased [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.27%
American Funds Managed Risk Growth Portfolio - Class P2 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.88% [1]
American Funds Managed Risk Growth Portfolio - Class P2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 55.25%
American Funds Managed Risk Growth Portfolio - Class P2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 21.57%
American Funds Managed Risk Growth Portfolio - Class P2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.03%
American Funds Managed Risk Growth and Income Portfolio - Class P2 | Asset allocation funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.99%
American Funds Managed Risk Growth and Income Portfolio - Class P2 | Options purchased [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.27%
American Funds Managed Risk Growth and Income Portfolio - Class P2 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [1]
American Funds Managed Risk Growth and Income Portfolio - Class P2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.11%
American Funds Managed Risk Growth and Income Portfolio - Class P2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.72%
American Funds Managed Risk Growth and Income Portfolio - Class P2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.85%
American Funds Managed Risk Growth and Income Portfolio - Class P2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.16%
American Funds Managed Risk Global Allocation Portfolio - Class P2 | Asset allocation funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.01%
American Funds Managed Risk Global Allocation Portfolio - Class P2 | Options purchased [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.22%
American Funds Managed Risk Global Allocation Portfolio - Class P2 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [1]
American Funds Managed Risk Global Allocation Portfolio - Class P2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.08%
American Funds Managed Risk Global Allocation Portfolio - Class P2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.84%
American Funds Managed Risk Global Allocation Portfolio - Class P2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.96%
American Funds Managed Risk Global Allocation Portfolio - Class P2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.08%
American Funds Managed Risk Global Allocation Portfolio - Class P2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.91%
American Funds IS 2070 Target Date Retirement Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.36%
American Funds IS 2070 Target Date Retirement Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.63%
American Funds IS 2070 Target Date Retirement Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.88%
American Funds IS 2070 Target Date Retirement Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.98%
American Funds IS 2070 Target Date Retirement Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.15%
American Funds IS 2070 Target Date Retirement Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.36%
American Funds IS 2070 Target Date Retirement Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.63%
American Funds IS 2070 Target Date Retirement Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.88%
American Funds IS 2070 Target Date Retirement Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.98%
American Funds IS 2070 Target Date Retirement Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.15%
American Funds IS 2070 Target Date Retirement Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.36%
American Funds IS 2070 Target Date Retirement Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.63%
American Funds IS 2070 Target Date Retirement Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.88%
American Funds IS 2070 Target Date Retirement Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.98%
American Funds IS 2070 Target Date Retirement Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.15%
American Funds IS 2070 Target Date Retirement Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.36%
American Funds IS 2070 Target Date Retirement Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.63%
American Funds IS 2070 Target Date Retirement Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.88%
American Funds IS 2070 Target Date Retirement Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.98%
American Funds IS 2070 Target Date Retirement Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.15%
American Funds IS 2065 Target Date Retirement Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.29%
American Funds IS 2065 Target Date Retirement Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.73%
American Funds IS 2065 Target Date Retirement Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.96%
American Funds IS 2065 Target Date Retirement Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.02%
American Funds IS 2065 Target Date Retirement Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2065 Target Date Retirement Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.29%
American Funds IS 2065 Target Date Retirement Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.73%
American Funds IS 2065 Target Date Retirement Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.96%
American Funds IS 2065 Target Date Retirement Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.02%
American Funds IS 2065 Target Date Retirement Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2065 Target Date Retirement Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.29%
American Funds IS 2065 Target Date Retirement Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.73%
American Funds IS 2065 Target Date Retirement Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.96%
American Funds IS 2065 Target Date Retirement Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.02%
American Funds IS 2065 Target Date Retirement Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2065 Target Date Retirement Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.29%
American Funds IS 2065 Target Date Retirement Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.73%
American Funds IS 2065 Target Date Retirement Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.96%
American Funds IS 2065 Target Date Retirement Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.02%
American Funds IS 2065 Target Date Retirement Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2060 Target Date Retirement Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.38%
American Funds IS 2060 Target Date Retirement Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.64%
American Funds IS 2060 Target Date Retirement Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.81%
American Funds IS 2060 Target Date Retirement Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.17%
American Funds IS 2060 Target Date Retirement Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2060 Target Date Retirement Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.38%
American Funds IS 2060 Target Date Retirement Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.64%
American Funds IS 2060 Target Date Retirement Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.81%
American Funds IS 2060 Target Date Retirement Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.17%
American Funds IS 2060 Target Date Retirement Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2060 Target Date Retirement Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.38%
American Funds IS 2060 Target Date Retirement Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.64%
American Funds IS 2060 Target Date Retirement Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.81%
American Funds IS 2060 Target Date Retirement Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.17%
American Funds IS 2060 Target Date Retirement Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2060 Target Date Retirement Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.38%
American Funds IS 2060 Target Date Retirement Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.64%
American Funds IS 2060 Target Date Retirement Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.81%
American Funds IS 2060 Target Date Retirement Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.17%
American Funds IS 2060 Target Date Retirement Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2055 Target Date Retirement Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 49.42%
American Funds IS 2055 Target Date Retirement Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.66%
American Funds IS 2055 Target Date Retirement Fund - Class 1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
American Funds IS 2055 Target Date Retirement Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.88%
American Funds IS 2055 Target Date Retirement Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
American Funds IS 2055 Target Date Retirement Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.04%
American Funds IS 2055 Target Date Retirement Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 49.42%
American Funds IS 2055 Target Date Retirement Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.66%
American Funds IS 2055 Target Date Retirement Fund - Class 1A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
American Funds IS 2055 Target Date Retirement Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.88%
American Funds IS 2055 Target Date Retirement Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
American Funds IS 2055 Target Date Retirement Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.04%
American Funds IS 2055 Target Date Retirement Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 49.42%
American Funds IS 2055 Target Date Retirement Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.66%
American Funds IS 2055 Target Date Retirement Fund - Class 2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
American Funds IS 2055 Target Date Retirement Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.88%
American Funds IS 2055 Target Date Retirement Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
American Funds IS 2055 Target Date Retirement Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.04%
American Funds IS 2055 Target Date Retirement Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 49.42%
American Funds IS 2055 Target Date Retirement Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.66%
American Funds IS 2055 Target Date Retirement Fund - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
American Funds IS 2055 Target Date Retirement Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.88%
American Funds IS 2055 Target Date Retirement Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
American Funds IS 2055 Target Date Retirement Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.04%
American Funds IS 2050 Target Date Retirement Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.86%
American Funds IS 2050 Target Date Retirement Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.62%
American Funds IS 2050 Target Date Retirement Fund - Class 1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.86%
American Funds IS 2050 Target Date Retirement Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.68%
American Funds IS 2050 Target Date Retirement Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.92%
American Funds IS 2050 Target Date Retirement Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.06%
American Funds IS 2050 Target Date Retirement Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.86%
American Funds IS 2050 Target Date Retirement Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.62%
American Funds IS 2050 Target Date Retirement Fund - Class 1A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.86%
American Funds IS 2050 Target Date Retirement Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.68%
American Funds IS 2050 Target Date Retirement Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.92%
American Funds IS 2050 Target Date Retirement Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.06%
American Funds IS 2050 Target Date Retirement Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.86%
American Funds IS 2050 Target Date Retirement Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.62%
American Funds IS 2050 Target Date Retirement Fund - Class 2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.86%
American Funds IS 2050 Target Date Retirement Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.68%
American Funds IS 2050 Target Date Retirement Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.92%
American Funds IS 2050 Target Date Retirement Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.06%
American Funds IS 2050 Target Date Retirement Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.86%
American Funds IS 2050 Target Date Retirement Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.62%
American Funds IS 2050 Target Date Retirement Fund - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.86%
American Funds IS 2050 Target Date Retirement Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.68%
American Funds IS 2050 Target Date Retirement Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.92%
American Funds IS 2050 Target Date Retirement Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.06%
American Funds IS 2045 Target Date Retirement Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 43.25%
American Funds IS 2045 Target Date Retirement Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
American Funds IS 2045 Target Date Retirement Fund - Class 1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.98%
American Funds IS 2045 Target Date Retirement Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 33.15%
American Funds IS 2045 Target Date Retirement Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.31%
American Funds IS 2045 Target Date Retirement Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.01%
American Funds IS 2045 Target Date Retirement Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 43.25%
American Funds IS 2045 Target Date Retirement Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
American Funds IS 2045 Target Date Retirement Fund - Class 1A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.98%
American Funds IS 2045 Target Date Retirement Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 33.15%
American Funds IS 2045 Target Date Retirement Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.31%
American Funds IS 2045 Target Date Retirement Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.01%
American Funds IS 2045 Target Date Retirement Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 43.25%
American Funds IS 2045 Target Date Retirement Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
American Funds IS 2045 Target Date Retirement Fund - Class 2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.98%
American Funds IS 2045 Target Date Retirement Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 33.15%
American Funds IS 2045 Target Date Retirement Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.31%
American Funds IS 2045 Target Date Retirement Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.01%
American Funds IS 2045 Target Date Retirement Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 43.25%
American Funds IS 2045 Target Date Retirement Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
American Funds IS 2045 Target Date Retirement Fund - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.98%
American Funds IS 2045 Target Date Retirement Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 33.15%
American Funds IS 2045 Target Date Retirement Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.31%
American Funds IS 2045 Target Date Retirement Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.01%
American Funds IS 2040 Target Date Retirement Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.20%
American Funds IS 2040 Target Date Retirement Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
American Funds IS 2040 Target Date Retirement Fund - Class 1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
American Funds IS 2040 Target Date Retirement Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.40%
American Funds IS 2040 Target Date Retirement Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
American Funds IS 2040 Target Date Retirement Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2040 Target Date Retirement Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.20%
American Funds IS 2040 Target Date Retirement Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
American Funds IS 2040 Target Date Retirement Fund - Class 1A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
American Funds IS 2040 Target Date Retirement Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.40%
American Funds IS 2040 Target Date Retirement Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
American Funds IS 2040 Target Date Retirement Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2040 Target Date Retirement Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.20%
American Funds IS 2040 Target Date Retirement Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
American Funds IS 2040 Target Date Retirement Fund - Class 2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
American Funds IS 2040 Target Date Retirement Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.40%
American Funds IS 2040 Target Date Retirement Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
American Funds IS 2040 Target Date Retirement Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2040 Target Date Retirement Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.20%
American Funds IS 2040 Target Date Retirement Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
American Funds IS 2040 Target Date Retirement Fund - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
American Funds IS 2040 Target Date Retirement Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.40%
American Funds IS 2040 Target Date Retirement Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
American Funds IS 2040 Target Date Retirement Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2035 Target Date Retirement Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 21.24%
American Funds IS 2035 Target Date Retirement Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.88%
American Funds IS 2035 Target Date Retirement Fund - Class 1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.07%
American Funds IS 2035 Target Date Retirement Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 29.86%
American Funds IS 2035 Target Date Retirement Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.95%
American Funds IS 2035 Target Date Retirement Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2035 Target Date Retirement Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 21.24%
American Funds IS 2035 Target Date Retirement Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.88%
American Funds IS 2035 Target Date Retirement Fund - Class 1A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.07%
American Funds IS 2035 Target Date Retirement Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 29.86%
American Funds IS 2035 Target Date Retirement Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.95%
American Funds IS 2035 Target Date Retirement Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2035 Target Date Retirement Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 21.24%
American Funds IS 2035 Target Date Retirement Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.88%
American Funds IS 2035 Target Date Retirement Fund - Class 2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.07%
American Funds IS 2035 Target Date Retirement Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 29.86%
American Funds IS 2035 Target Date Retirement Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.95%
American Funds IS 2035 Target Date Retirement Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds IS 2035 Target Date Retirement Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 21.24%
American Funds IS 2035 Target Date Retirement Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.88%
American Funds IS 2035 Target Date Retirement Fund - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.07%
American Funds IS 2035 Target Date Retirement Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 29.86%
American Funds IS 2035 Target Date Retirement Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.95%
American Funds IS 2035 Target Date Retirement Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds® IS 2030 Target Date Retirement Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.36%
American Funds® IS 2030 Target Date Retirement Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.99%
American Funds® IS 2030 Target Date Retirement Fund - Class 1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.84%
American Funds® IS 2030 Target Date Retirement Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.10%
American Funds® IS 2030 Target Date Retirement Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
American Funds® IS 2030 Target Date Retirement Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.01%
American Funds® IS 2030 Target Date Retirement Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.36%
American Funds® IS 2030 Target Date Retirement Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.99%
American Funds® IS 2030 Target Date Retirement Fund - Class 1A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.84%
American Funds® IS 2030 Target Date Retirement Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.10%
American Funds® IS 2030 Target Date Retirement Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
American Funds® IS 2030 Target Date Retirement Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.01%
American Funds® IS 2030 Target Date Retirement Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.36%
American Funds® IS 2030 Target Date Retirement Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.99%
American Funds® IS 2030 Target Date Retirement Fund - Class 2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.84%
American Funds® IS 2030 Target Date Retirement Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.10%
American Funds® IS 2030 Target Date Retirement Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
American Funds® IS 2030 Target Date Retirement Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.01%
American Funds® IS 2030 Target Date Retirement Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.36%
American Funds® IS 2030 Target Date Retirement Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 37.99%
American Funds® IS 2030 Target Date Retirement Fund - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.84%
American Funds® IS 2030 Target Date Retirement Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.10%
American Funds® IS 2030 Target Date Retirement Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
American Funds® IS 2030 Target Date Retirement Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.01%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.77%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 45.03%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.80%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.77%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 45.03%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.80%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds® IS 2025 Target Date Retirement Income Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.77%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 45.03%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.80%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
American Funds® IS 2025 Target Date Retirement Income Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds® IS 2025 Target Date Retirement Income Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.77% [2]
American Funds® IS 2025 Target Date Retirement Income Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 45.03% [2]
American Funds® IS 2025 Target Date Retirement Income Fund - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.80% [2]
American Funds® IS 2025 Target Date Retirement Income Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 23.40% [2]
American Funds® IS 2025 Target Date Retirement Income Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.00% [2]
American Funds® IS 2025 Target Date Retirement Income Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.94%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.36%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.65%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 21.41%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.68%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.04%)
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1A  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.94%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.36%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.65%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 21.41%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.68%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.04%)
American Funds® IS 2020 Target Date Retirement Income Fund - Class 2  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.94%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.36%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.65%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 21.41%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.68%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.04%)
American Funds® IS 2020 Target Date Retirement Income Fund - Class 4  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 4 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.94%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.36%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.65%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 21.41%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.68%
American Funds® IS 2020 Target Date Retirement Income Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.04%)
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 49.70%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.90%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.99%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.49%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.08%)
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1A  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 49.70%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.90%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.99%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.49%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.08%)
American Funds® IS 2015 Target Date Retirement Income Fund - Class 2  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 49.70%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.90%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.99%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.49%
American Funds® IS 2015 Target Date Retirement Income Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.08%)
American Funds IS 2015 Target Date Fund - Class 4  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds IS 2015 Target Date Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 49.70%
American Funds IS 2015 Target Date Fund - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.90%
American Funds IS 2015 Target Date Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.99%
American Funds IS 2015 Target Date Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.49%
American Funds IS 2015 Target Date Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.08%)
American Funds IS 2010 Target Date Fund - Class 1  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds IS 2010 Target Date Fund - Class 1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 51.76%
American Funds IS 2010 Target Date Fund - Class 1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.26%
American Funds IS 2010 Target Date Fund - Class 1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.77%
American Funds IS 2010 Target Date Fund - Class 1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.29%
American Funds IS 2010 Target Date Fund - Class 1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.08%)
American Funds IS 2010 Target Date Retirement Income Fund - Class 1A  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds IS 2010 Target Date Retirement Income Fund - Class 1A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 51.76%
American Funds IS 2010 Target Date Retirement Income Fund - Class 1A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.26%
American Funds IS 2010 Target Date Retirement Income Fund - Class 1A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.77%
American Funds IS 2010 Target Date Retirement Income Fund - Class 1A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.29%
American Funds IS 2010 Target Date Retirement Income Fund - Class 1A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.08%)
American Funds IS 2010 Target Date Retirement Income Fund - Class 2  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds IS 2010 Target Date Retirement Income Fund - Class 2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 51.76%
American Funds IS 2010 Target Date Retirement Income Fund - Class 2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.26%
American Funds IS 2010 Target Date Retirement Income Fund - Class 2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.77%
American Funds IS 2010 Target Date Retirement Income Fund - Class 2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.29%
American Funds IS 2010 Target Date Retirement Income Fund - Class 2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.08%)
American Funds IS 2010 Target Date Retirement Income Fund - Class 4  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
American Funds IS 2010 Target Date Retirement Income Fund - Class 4 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 51.76%
American Funds IS 2010 Target Date Retirement Income Fund - Class 4 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.26%
American Funds IS 2010 Target Date Retirement Income Fund - Class 4 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.77%
American Funds IS 2010 Target Date Retirement Income Fund - Class 4 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.29%
American Funds IS 2010 Target Date Retirement Income Fund - Class 4 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.08%)
[1] Includes derivatives.
[2] Less than 0.01%.