Investments (Components of Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (81)	$ (43)
Fixed maturity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(34)	(37)
Equity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(1)	(2)
Mortgage loans
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(43)	(5)
Limited partnerships and LLCs
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(1)	0
Other
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (2)	$ 1