Investments (Details 25) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Rollforward of the Cumulative Credit Loss Component of OTTI income (loss)
Balance, beginning of period	$ 389	$ 424	$ 443	$ 581
Additions:
Initial impairments - credit loss OTTI recognized on securities not previously impaired	18	62	26	81
Additional impairments - credit loss OTTI recognized on securities previously impaired	24	39	40	70
Reductions:
Due to sales (maturities, pay downs or prepayments) during the period of securities previously credit loss OTTI impaired	(26)	(30)	(55)	(134)
Due to securities de-recognized in connection with the adoption of new guidance related to the consolidation of VIEs	0	0	0	(100)
Due to securities impaired to net present value of expected future cash flows	0	0	(44)	0
Due to increases in cash flows- accretion of previous credit loss OTTI	(4)	(4)	(9)	(7)
Balance, end of period	$ 401	$ 491	$ 401	$ 491