Investments (Net realized investment gains (losses)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Fixed maturity securities:
Gross gains	$ 19	$ 5	$ 25	$ 18
Gross losses	(27)	(53)	(47)	(75)
Net investment gains (losses) on fixed maturity securities	(8)	(48)	(22)	(57)
Equity securities	3	6	(1)	6
Net investment gains (losses)	(5)	(46)	(23)	(55)
Mortgage loans	0	(5)	0	(5)
Short-term investments and other	$ 0	$ 1	$ 0	$ 1