Investments (Components of Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (62)	$ (52)	$ (225)	$ (213)
Fixed maturity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(48)	(54)	(181)	(183)
Equity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(1)	0	(4)	(4)
Mortgage loans
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(15)	3	(42)	(24)
Limited partnerships and LLCs
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	0	0	(1)	0
Other assets
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ 2	$ (1)	$ 3	$ (2)