Investments (Net Inv Inc summary) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investment income on fixed maturities	$ 349	$ 339	$ 1,046	$ 1,002
Net realized gains (losses)	(10)	4	(6)	15
Affordable housing partnerships	(26)	(24)	(58)	(49)
Other	19	43	67	132
Consolidated investment entities	24	24	72	101
Total	$ 356	$ 386	$ 1,121	$ 1,201