Investments and Derivative Instruments (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Other-Than-Temporary Impairment Losses
Balance as of beginning of period	$ (531)		$ (906)		$ (552)	$ (1,013)
Additions for credit impairments recognized on securities not previously impaired	(1)	[1]	(5)	[1]	(8)	(13)
Additions for credit impairments recognized on securities previously impaired	(3)	[1]	(7)	[1]	(14)	(9)
Securities that matured or were sold during the period	40		12		73	126
Securities due to an increase in expected cash flows	7		4		13	7
Balance as of end of period	$ (488)		$ (902)		$ (488)	$ (902)

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