Investments (Available-For-Sale Securities By Contractual Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	$ 110,944	$ 104,526
Available-for-sale Securities, Debt Maturities, Fair Value
Available-for-sale Securities, Debt Securities, Total	99,465	$ 117,511
Fixed Maturity AFS Securities Excluding Structured Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Due in one year or less	3,239
Due after one year through five years	17,545
Due after five years through ten years	18,985
Due after ten years	55,451
Amortized Cost	95,220
Available-for-sale Securities, Debt Maturities, Fair Value
Due in one year or less	3,205
Due after one year through five years	16,716
Due after five years through ten years	17,177
Due after ten years	47,965
Available-for-sale Securities, Debt Securities, Total	85,063
Structured Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	15,724
Available-for-sale Securities, Debt Maturities, Fair Value
Available-for-sale Securities, Debt Securities, Total	$ 14,402

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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