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Investments (Available-For-Sale Securities By Contractual Maturities) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	$ 107,622	$ 105,177
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	110,695	118,746
Fixed Maturity AFS Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	107,622	105,177
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	110,695	$ 118,746
Fixed Maturity AFS Securities [Member] | Fixed maturity AFS securities other than structured securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Due in one year or less	3,095
Due after one year through five years	16,078
Due after five years through ten years	19,211
Due after ten years	56,246
Amortized Cost	94,630
Available-for-sale Securities, Debt Maturities, Fair Value
Due in one year or less	3,096
Due after one year through five years	16,061
Due after five years through ten years	19,096
Due after ten years	59,583
Fair Value	97,836
Fixed Maturity AFS Securities [Member] | Structured securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	12,992
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	$ 12,859

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