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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 40,219 | $ 37,708
Fair Value |  |
Total fixed maturity available-for-sale securities, Fair Value | 36,110 | 33,095
Other securities, which provide for periodic payments: |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 18,464 | 17,210
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 17,302 | 16,083
Corporates, Non-structured Hybrids, Municipal and Government securities: |  |
Amortized Cost |  |
Due in one year or less | 586 | 536
Due after one year through five years | 3,921 | 3,288
Due after five years through ten years | 2,265 | 2,171
Due after ten years | 14,983 | 14,503
Subtotal, Amortized Cost | 21,755 | 20,498
Fair Value |  |
Due in one year or less | 574 | 527
Due after one year through five years | 3,745 | 3,089
Due after five years through ten years | 2,079 | 1,939
Due after ten years | 12,410 | 11,457
Subtotal, Fair Value | 18,808 | 17,012
Asset-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 12,620 | 12,209
Amortized Cost | 12,620 | 12,209
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 11,892 | 11,467
Total fixed maturity available-for-sale securities, Fair Value | 11,892 | 11,467
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 4,048 | 3,337
Amortized Cost | 4,048 | 3,337
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 3,715 | 3,063
Total fixed maturity available-for-sale securities, Fair Value | 3,715 | 3,063
Structured hybrids |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 26 | 26
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 26 | 26
Residential mortgage-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 1,770 | 1,638
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | $ 1,669 | $ 1,527

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