Investments (Components of Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (246)	$ (248)	$ (59)
Fixed maturity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(224)	(192)	(21)
Equity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	5	(14)	0
Mortgage loans
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(24)	(20)	(27)
Limited partnerships and LLCs
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(1)	(20)	0
Other
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (2)	$ (2)	$ (11)