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Investments (Available-For-Sale Securities By Contractual Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	$ 107,459	$ 104,174
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	122,085	123,044
Fixed Maturity AFS Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	107,459	104,174
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	122,085	$ 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	3,126
Due after one year through five years	15,454
Due after five years through ten years	19,277
Due after ten years	57,201
Amortized Cost	95,058
Available-for-sale Securities, Debt Maturities, Fair Value
Due in one year or less	3,154
Due after one year through five years	16,362
Due after five years through ten years	21,021
Due after ten years	68,716
Fair Value	109,253
Fixed Maturity AFS Securities [Member] | Structured securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	12,401
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	$ 12,832

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