Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Amortized cost, due in one year or less	$ 1,178
Amortized cost, due after one year through five years	13,349
Amortized cost, due after five years through ten years	17,187
Amortized cost, due after ten years	31,108
Amortized cost, Structured Securities	21,486
Fixed maturity securities, amortized cost	84,308	$ 78,287
Estimated fair value, due in one year or less	1,158
Estimated fair value, due after one year through five years	12,521
Estimated fair value, due after five years through ten years	14,788
Estimated fair value, due after ten years	26,389
Estimated fair value, Structured Securities	19,563
Fixed maturity securities, estimated fair value	$ 74,419	$ 86,527