Investments (Available-For-Sale Securities By Contractual Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	$ 105,177	$ 104,174
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	118,746	123,044
Fixed Maturity AFS Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	105,177	104,174
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	118,746	$ 123,044
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	3,016
Due after one year through five years	15,243
Due after five years through ten years	18,900
Due after ten years	55,693
Amortized Cost	92,852
Available-for-sale Securities, Debt Maturities, Fair Value
Due in one year or less	3,032
Due after one year through five years	15,896
Due after five years through ten years	20,251
Due after ten years	66,931
Fair Value	106,110
Fixed Maturity AFS Securities [Member] \| Structured securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	12,325
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	$ 12,636

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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