Investments and Derivative Instruments Level 4 Other-Than-Temporary Impairment Losses (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other-Than-Temporary Impairment Losses [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease)		$ 40	$ 14	$ 63	$ 43
Other-Than-Temporary Impairment Losses [Roll Forward]
Balance as of beginning of period		(388)	(488)	(424)	(552)
Additions for credit impairments recognized on securities not previously impaired	[1]	0	(1)	(3)	(9)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	[1]	12	3	13	17
Securities that matured or were sold during the period		51	49	61	122
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status		0	0	2	0
Securities due to an increase in expected cash flows		12	6	40	19
Balance as of end of period		$ (337)	$ (437)	$ (337)	$ (437)

[1] These additions are included in the net OTTI losses recognized in earnings in the Condensed Consolidated Statements of Operations.