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Investments (Available-For-Sale Securities By Contractual Maturities) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	$ 106,668	$ 104,174
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	122,215	123,044
Fixed Maturity AFS Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	106,668	104,174
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	122,215	$ 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	3,064
Due after one year through five years	15,376
Due after five years through ten years	19,284
Due after ten years	56,655
Amortized Cost	94,379
Available-for-sale Securities, Debt Maturities, Fair Value
Due in one year or less	3,095
Due after one year through five years	16,338
Due after five years through ten years	21,233
Due after ten years	68,767
Fair Value	109,433
Fixed Maturity AFS Securities [Member] | Structured securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	12,289
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	$ 12,782

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