Investments (Components of Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (52)	$ (40)	$ (213)	$ (171)
Fixed maturity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(54)	(37)	(183)	(138)
Equity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	0	(1)	(4)	(11)
Mortgage loans
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	3	2	(24)	(1)
Limited partnerships and LLCs
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	0	(4)	0	(21)
Other
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (1)	$ 0	$ (2)	$ 0