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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | $ 22,844 | $ 21,935
Amortized Cost | 47,789 | 45,606
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 22,397 | 21,246
Total fixed maturity available-for-sale securities, Fair Value | 44,566 | 42,373
Corporates, Non-structured Hybrids, Municipal and Government securities: |  |
Amortized Cost |  |
Due in one year or less | 709 | 703
Due after one year through five years | 4,765 | 4,320
Due after five years through ten years | 3,940 | 3,195
Due after ten years | 15,531 | 15,453
Subtotal, Amortized Cost | 24,945 | 23,671
Fair Value |  |
Due in one year or less | 691 | 687
Due after one year through five years | 4,643 | 4,209
Due after five years through ten years | 3,770 | 3,048
Due after ten years | 13,065 | 13,183
Subtotal, Fair Value | 22,169 | 21,127
Asset-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 15,254 | 14,631
Amortized Cost | 15,254 | 14,631
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 15,115 | 14,342
Total fixed maturity available-for-sale securities, Fair Value | 15,115 | 14,342
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 5,040 | 4,797
Amortized Cost | 5,040 | 4,797
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 4,818 | 4,475
Total fixed maturity available-for-sale securities, Fair Value | 4,818 | 4,475
Residential mortgage-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 2,550 | 2,507
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | $ 2,464 | $ 2,429

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