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Investments (Available-For-Sale Securities By Contractual Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	$ 104,174	$ 94,295
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	123,044	$ 105,200
Fixed Maturity AFS Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	104,174
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	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	3,319
Due after one year through five years	15,016
Due after five years through ten years	19,105
Due after ten years	55,538
Amortized Cost	92,978
Available-for-sale Securities, Debt Maturities, Fair Value
Due in one year or less	3,344
Due after one year through five years	16,052
Due after five years through ten years	21,660
Due after ten years	70,223
Fair Value	111,279
Fixed Maturity AFS Securities [Member] | Structured securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	11,196
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	$ 11,765

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