Investments (Net realized investment gains (losses)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fixed maturity securities:
Gross gains	$ 13	$ 8	$ 27	$ 43
Gross losses	(25)	(35)	(71)	(92)
Net investment gains (losses) on fixed maturity securities	(12)	(27)	(44)	(49)
Equity securities	1	3	12	(11)
Mortgage loans	0	(6)	0	(6)
Short-term investments and other	1	(2)	0	(1)
Net investment gains (losses)	$ (10)	$ (32)	$ (32)	$ (67)