Investments and Derivative Instruments (Details 18) (Net realized capital gains (losses) [Member], USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Instruments Gain (Loss) [Line Items]
Total	$ 65	$ 232	$ (402)	$ 181
Interest rate swaps, swaptions, caps, floors and forwards [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	(4)	(5)	1	(5)
Foreign currency swaps and forwards [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	(7)	23	(12)	29
Japan 3 Win Related Foreign Currency Swaps [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	33	65	(25)	9
Japanese fixed annuity hedging instruments [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	57	160	(5)	141
Japanese variable annuity hedging instruments [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	6	32	(56)	45
Credit derivatives that purchase credit protection [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	(3)	38	(20)	38
Credit derivatives that assume credit risk [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	(14)	(50)	5	(13)
Equity index swaps, options, and futures [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	2	4	2	5
GMWB product derivatives [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	(84)	(1,497)	279	(1,144)
GMWB Reinsurance [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	4	246	(61)	185
GMWB hedging instruments [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	43	825	(184)	662
Macro hedge program [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	35	397	(322)	233
GMAB product derivatives [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	(2)	(5)	(1)	(2)
Contingent capital facility put option [Member]
Derivative Instruments Gain (Loss) [Line Items]
Total	$ (1)	$ (1)	$ (3)	$ (2)