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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | $ 23,447 | $ 21,935
Amortized Cost | 49,229 | 45,606
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 23,002 | 21,246
Total fixed maturity available-for-sale securities, Fair Value | 45,746 | 42,373
Corporates, Non-structured Hybrids, Municipal and Government securities: |  |
Amortized Cost |  |
Due in one year or less | 815 | 703
Due after one year through five years | 4,877 | 4,320
Due after five years through ten years | 4,160 | 3,195
Due after ten years | 15,930 | 15,453
Subtotal, Amortized Cost | 25,782 | 23,671
Fair Value |  |
Due in one year or less | 800 | 687
Due after one year through five years | 4,743 | 4,209
Due after five years through ten years | 3,990 | 3,048
Due after ten years | 13,211 | 13,183
Subtotal, Fair Value | 22,744 | 21,127
Asset-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 15,689 | 14,631
Amortized Cost | 15,689 | 14,631
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 15,559 | 14,342
Total fixed maturity available-for-sale securities, Fair Value | 15,559 | 14,342
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 5,217 | 4,797
Amortized Cost | 5,217 | 4,797
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 4,989 | 4,475
Total fixed maturity available-for-sale securities, Fair Value | 4,989 | 4,475
Residential mortgage-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 2,541 | 2,507
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | $ 2,454 | $ 2,429

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