Investments (Net realized investment gains (losses)) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fixed maturity securities:
Gross gains	$ 8,000,000	$ 45,000,000	$ 43,000,000	$ 71,000,000
Gross losses	(35,000,000)	(60,000,000)	(92,000,000)	(88,000,000)
Net investment gains (losses) on fixed maturity securities	(27,000,000)	(15,000,000)	(49,000,000)	(17,000,000)
Equity securities	3,000,000	(71,000,000)	(11,000,000)	(109,000,000)
Derivatives	0	26,000,000	0	55,000,000
Mortgage loans	(6,000,000)	0	(6,000,000)	0
Short term investments and other	(2,000,000)	1,000,000	(1,000,000)	1,000,000
Net investment gains (losses)	(32,000,000)	(59,000,000)	(67,000,000)	(70,000,000)
Non-redeemable preferred stock
Fixed maturity securities:
Net investment income (loss) recognized due to the change in fair value of common stock held as of June 30, 2023 and 2022	$ 3,000,000	$ (70,000,000)	$ 0	$ (108,000,000)