Investments (Net Inv Inc summary) (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Investment income on fixed maturities	$ 342	$ 346	$ 1,028	$ 1,055
Net realized gains (losses)	6	(10)	(5)	5
Affordable housing partnerships	(17)	(7)	(35)	(25)
Other	25	(10)	13	32
Consolidated investment entities	31	2	89	161
Total	$ 387	$ 321	$ 1,090	$ 1,228