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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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