Investments and Derivative Instruments (Details 1) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net Realized Capital Gains (Losses)
Gross gains on sales	$ 261	$ 343	$ 322	$ 475
Gross losses on sales	(98)	(94)	(231)	(205)
Net OTTI losses recognized in earnings	(23)	(108)	(78)	(260)
Valuation allowances on mortgage loans	26	(40)	23	(152)
Japanese fixed annuity contract hedges, net	6	27	(11)	11
Periodic net coupon settlements on credit derivatives/Japan	(2)	(4)	(9)	(11)
Results of variable annuity hedge program [Line Items]
Total results of variable annuity hedge program	(2)	(29)	(288)	(64)
Other, net	(99)	(86)	(62)	(59)
Total net realized capital gains (losses)	69	9	(334)	(265)
GMWB derivatives, net [Member]
Results of variable annuity hedge program [Line Items]
Results of variable annuity hedge program	(37)	(426)	34	(297)
Macro hedge program [Member]
Results of variable annuity hedge program [Line Items]
Results of variable annuity hedge program	$ 35	$ 397	$ (322)	$ 233