Investments (Net realized investment gains (losses)) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fixed maturity securities:
Gross gains	$ 12,000,000	$ 23,000,000	$ 55,000,000	$ 94,000,000
Gross losses	(49,000,000)	(134,000,000)	(141,000,000)	(222,000,000)
Net investment gains (losses) on fixed maturity securities	(37,000,000)	(111,000,000)	(86,000,000)	(128,000,000)
Equity securities	2,000,000	(2,000,000)	(9,000,000)	(111,000,000)
Derivatives	0	24,000,000	0	79,000,000
Mortgage loans	(5,000,000)	(8,000,000)	(11,000,000)	(8,000,000)
Short term investments and other	2,000,000	1,000,000	1,000,000	2,000,000
Net investment gains (losses)	(38,000,000)	(96,000,000)	(105,000,000)	(166,000,000)
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 September 30, 2023 and 2022	$ 2,000,000	$ (2,000,000)	$ 2,000,000	$ (109,000,000)