Investments and Derivative Instruments (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Change in non-credit impairments of debt securities recognized in OCI
OTTI losses recognized in OCI	$ (8)	$ (184)	$ (72)	$ (372)
Changes in fair value and/or sales	3	223	67	477
Tax and deferred acquisition costs	1	(18)	6	(52)
Change in non-credit impairments recognized in OCI	$ (4)	$ 21	$ 1	$ 53