Investments (Components of Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (63)	$ 279	$ 92
Fixed maturity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(22)	298	87
Equity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	0	0	17
Mortgage loans
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(29)	(27)	(10)
Limited partnerships and LLCs
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	0	(3)	7
Other
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (12)	$ 11	$ (9)