Investments- Realized Capital Gains and Losses by Transaction Type (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments [Abstract]
Impairment write-downs	$ 2	$ (10)	$ (2)	$ (28)
Change in intent write-downs	(21)	(7)	(40)	(15)
Net other-than-temporary impairment losses recognized in earnings	(19)	(17)	(42)	(43)
Sales	43	6	51	90
Valuation and settlements of derivative instruments	4	(5)	9	14
Total realized capital gains and losses	28	(16)	18	61
Fixed income securities
Investments [Abstract]
Net other-than-temporary impairment losses recognized in earnings	(3)	(5)	(3)	(41)
Total realized capital gains and losses	(1)	(12)	(1)	(6)
Schedule of Available for Sale Securities
Gross gains on sales of fixed income securities	23	18	76	117
Gross losses on sales of fixed income securities	$ 5	$ 16	$ 34	$ 40