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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, Amortized Cost	$ 536	$ 426
Due after one year through five years, Amortized Cost	3,288	2,998
Due after five years through ten years, Amortized Cost	2,171	2,389
Due after ten years, Amortized Cost	14,503	12,930
Subtotal, Amortized Cost	20,498	18,743
Other securities which provide for periodic payments, Amortized Cost	17,210	11,962
Due in one year or less, Fair Value	527	431
Due after one year through five years, Fair Value	3,089	3,051
Due after five years through ten years, Fair Value	1,939	2,458
Due after ten years, Fair Value	11,457	13,608
Subtotal, Fair Value	17,012	19,548
Other securities which provide for periodic payments, Fair Value	16,083	12,442
Amortized Cost	37,708	30,705
Fair Value	33,095	31,990
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Other securities which provide for periodic payments, Amortized Cost	12,209	8,516
Other securities which provide for periodic payments, Fair Value	11,467	8,695
Amortized Cost	12,209	8,516
Fair Value	11,467	8,695
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Other securities which provide for periodic payments, Amortized Cost	3,337	2,684
Other securities which provide for periodic payments, Fair Value	3,063	2,979
Amortized Cost	3,337	2,684
Fair Value	3,063	2,979
Structured hybrids
Debt Securities, Available-for-sale [Line Items]
Other securities which provide for periodic payments, Amortized Cost	26	31
Other securities which provide for periodic payments, Fair Value	26	37
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Other securities which provide for periodic payments, Amortized Cost	1,638	731
Other securities which provide for periodic payments, Fair Value	$ 1,527	$ 731

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