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Investments - Schedule of Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | $ 26,846 | $ 24,032
Amortized Cost | 55,913 | 51,681
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 26,624 | 23,634
Total fixed maturity available-for-sale securities, Fair Value | 53,501 | 48,218
Corporates, Non-structured Hybrids, Municipal and Government securities: |  |
Amortized Cost |  |
Due in one year or less | 860 | 961
Due after one year through five years | 5,193 | 4,616
Due after five years through ten years | 5,532 | 5,311
Due after ten years | 17,482 | 16,761
Subtotal, Amortized Cost | 29,067 | 27,649
Fair Value |  |
Due in one year or less | 852 | 955
Due after one year through five years | 5,217 | 4,544
Due after five years through ten years | 5,545 | 5,126
Due after ten years | 15,263 | 13,959
Subtotal, Fair Value | 26,877 | 24,584
Asset-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 18,346 | 15,784
Amortized Cost | 18,346 | 15,784
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 18,265 | 15,656
Total fixed maturity available-for-sale securities, Fair Value | 18,265 | 15,656
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 5,525 | 5,379
Amortized Cost | 5,525 | 5,379
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 5,388 | 5,182
Total fixed maturity available-for-sale securities, Fair Value | 5,388 | 5,182
Residential mortgage-backed securities |  |
Amortized Cost |  |
Other securities which provide for periodic payments, Amortized Cost | 2,975 | 2,869
Amortized Cost | 2,975 | 2,869
Fair Value |  |
Other securities which provide for periodic payments, Fair Value | 2,971 | 2,796
Total fixed maturity available-for-sale securities, Fair Value | $ 2,971 | $ 2,796

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