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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Total fixed maturity available-for-sale securities, Amortized Cost | $ 28,837 | $ 25,577
Total fixed maturity available-for-sale securities, Fair Value | 30,435 | 27,587
Other Securities that Provide Periodic Payments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 11,275 |
Other securities which provide for periodic payments, Fair Value | 11,987 |
Corporates, Non-structured Hybrids, Municipal and Government securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due in one year or less, Amortized Cost | 387 |
Due after one year through five years, Amortized Cost | 2,668 |
Due after five years through ten years, Amortized Cost | 2,593 |
Due after ten years, Amortized Cost | 11,914 |
Subtotal, Amortized Cost | 17,562 |
Due in one year or less, Fair Value | 391 |
Due after one year through five years, Fair Value | 2,758 |
Due after five years through ten years, Fair Value | 2,683 |
Due after ten years, Fair Value | 12,616 |
Subtotal, Fair Value | 18,448 |
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 7,916 |
Total fixed maturity available-for-sale securities, Amortized Cost | 7,916 | 5,941
Other securities which provide for periodic payments, Fair Value | 8,190 |
Total fixed maturity available-for-sale securities, Fair Value | 8,191 | 6,266
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 2,619 |
Total fixed maturity available-for-sale securities, Amortized Cost | 2,619 | 2,490
Other securities which provide for periodic payments, Fair Value | 3,024 |
Total fixed maturity available-for-sale securities, Fair Value | 3,024 | $ 2,829
Structured hybrids |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 26 |
Other securities which provide for periodic payments, Fair Value | 32 |
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 714 |
Other securities which provide for periodic payments, Fair Value | $ 741 |

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