Investments (Available-For-Sale Securities By Contractual Maturities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	$ 111,528	$ 111,707
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	101,936	$ 99,736
Fixed Maturity AFS Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	111,528
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	101,936
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	3,348
Due after one year through five years	17,818
Due after five years through ten years	17,991
Due after ten years	56,038
Amortized Cost	95,195
Available-for-sale Securities, Debt Maturities, Fair Value
Due in one year or less	3,309
Due after one year through five years	17,052
Due after five years through ten years	16,552
Due after ten years	49,844
Fair Value	86,757
Fixed Maturity AFS Securities [Member] \| Structured securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	16,333
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	$ 15,179

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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