Investments (Components of Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (298)	$ (242)	$ (240)
Fixed maturity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(243)	(214)	(188)
Equity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(12)	(1)	(12)
Mortgage loans
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(55)	(24)	(20)
Limited partnerships and LLCs
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(2)	(1)	(20)
Other
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ 14	$ (2)	$ 0