Investments (Components of Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Net investment gains (losses), fixed maturity securities	$ (21)	$ 68	$ (27)	$ 53
Net investment gains (losses), equity securities	7	1	(7)	11
Net investment gains (losses), mortgage loans	(22)	(3)	(26)	(7)
Net investment gains (losses), limited partnerships and LLCs	(2)	(2)	(3)	(5)
Net investment gains (losses), other	4	(1)	10	0
Net investment gains (losses)	$ (34)	$ 63	$ (53)	$ 52