Investments (Components of Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ (43)	$ (96)
Fixed maturity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(37)	(74)
Equity securities
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(2)	(5)
Mortgage loans
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	(5)	(17)
Other assets
Net Investment Gains (Losses) [Line Items]
Net investment gains (losses)	$ 1	$ 0