Investments (Net Inv Inc summary) (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Investment income on fixed maturities	$ 346	$ 365	$ 1,055	$ 1,114
Net realized gains (losses)	(10)	4	5	10
Affordable housing partnerships	(7)	(8)	(25)	(20)
Other	(10)	26	32	70
Consolidated investment entities	2	41	161	158
Total net investment income	$ 321	$ 428	$ 1,228	$ 1,332