Investments (Net Inv Inc summary) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investment income on fixed maturities	$ 322		$ 353
Net realized gains (losses)	(19)	[1]	4
Affordable housing partnerships	(14)		(15)
Other	22		32
Consolidated investment entities	17		23
Total	328		$ 397
Allowance for credit losses	$ 13

[1] Includes the change in the allowance for credit losses of $24 million for the three months ended March 31, 2020.