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
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total	$ 104,526	$ 103,021
Available-for-sale Securities, Debt Maturities, Fair Value
Available-for-sale Securities, Debt Securities, Total	117,511	$ 121,111
Fixed Maturity AFS Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total	104,526
Available-for-sale Securities, Debt Maturities, Fair Value
Available-for-sale Securities, Debt Securities, Total	117,511
Fixed Maturity AFS Securities Excluding Structured Securities [Member] \| Fixed Maturity AFS Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Due in one year or less	2,854
Due after one year through five years	15,315
Due after five years through ten years	19,344
Due after ten years	54,906
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total	92,419
Available-for-sale Securities, Debt Maturities, Fair Value
Due in one year or less	2,868
Due after one year through five years	15,944
Due after five years through ten years	20,660
Due after ten years	65,638
Available-for-sale Securities, Debt Securities, Total	105,110
Structured Securities [Member] \| Fixed Maturity AFS Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total	12,107
Available-for-sale Securities, Debt Maturities, Fair Value
Available-for-sale Securities, Debt Securities, Total	$ 12,401

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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