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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost
Amortized Cost	$ 33,836	$ 30,705
Fair Value
Total fixed maturity available-for-sale securities, Fair Value	30,432	31,990
Other securities, which provide for periodic payments:
Amortized Cost
Other securities which provide for periodic payments, Amortized Cost	14,091	11,962
Fair Value
Other securities which provide for periodic payments, Fair Value	13,429	12,442
Corporates, Non-structured Hybrids, Municipal and Government securities:
Amortized Cost
Due in one year or less	524	426
Due after one year through five years	3,386	2,998
Due after five years through ten years	2,103	2,389
Due after ten years	13,732	12,930
Subtotal, Amortized Cost	19,745	18,743
Fair Value
Due in one year or less	523	431
Due after one year through five years	3,218	3,051
Due after five years through ten years	1,918	2,458
Due after ten years	11,344	13,608
Subtotal, Fair Value	17,003	19,548
Asset-backed securities
Amortized Cost
Other securities which provide for periodic payments, Amortized Cost	9,965	8,516
Amortized Cost	9,965	8,516
Fair Value
Other securities which provide for periodic payments, Fair Value	9,448	8,695
Total fixed maturity available-for-sale securities, Fair Value	9,448	8,695
Commercial mortgage-backed securities
Amortized Cost
Other securities which provide for periodic payments, Amortized Cost	3,123	2,684
Amortized Cost	3,123	2,684
Fair Value
Other securities which provide for periodic payments, Fair Value	3,053	2,979
Total fixed maturity available-for-sale securities, Fair Value	3,053	2,979
Structured hybrids
Amortized Cost
Other securities which provide for periodic payments, Amortized Cost	26	31
Fair Value
Other securities which provide for periodic payments, Fair Value	26	37
Residential mortgage-backed securities
Amortized Cost
Other securities which provide for periodic payments, Amortized Cost	977	731
Fair Value
Other securities which provide for periodic payments, Fair Value	$ 902	$ 731

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