Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Amortized cost, due in one year or less	$ 1,014
Amortized cost, due after one year through five years	12,828
Amortized cost, due after five years through ten years	17,302
Amortized cost, due after ten years	30,782
Amortized cost, Structured Securities	20,708
Fixed maturity securities, amortized cost	82,634	$ 78,287
Estimated fair value, due in one year or less	1,007
Estimated fair value, due after one year through five years	12,405
Estimated fair value, due after five years through ten years	15,765
Estimated fair value, due after ten years	28,910
Estimated fair value, Structured Securities	19,625
Fixed maturity securities, estimated fair value	$ 77,712	$ 86,527