Investments and Derivative Instruments (Details 18) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ (739)		$ 788		$ (1,153)		$ (745)
Interest rate swaps, swap options , caps, floors and forwards [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	(18)		(3)		(8)		(2)
Foreign currency swaps and forwards [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	5		16		5		13
Japan 3Win Related Foreign Currency Swaps [Member] | JAPAN
Derivative Instruments, Gain (Loss) [Line Items]
Total	(54)	[1]	60	[1]	(184)	[1]	(121)	[1]
Fixed annuity hedging instruments [Member] | JAPAN
Derivative Instruments, Gain (Loss) [Line Items]
Total	(55)	[2]	58	[2]	(156)	[2]	(70)	[2]
Credit Derivatives that Purchase Credit Protection [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	(4)		4		(9)		(19)
Credit Derivatives that Assume Credit Risk [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	11		23		20		133
Equity index swaps and options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	(2)		3		(16)		(13)
GMWB product derivatives [Member] | U.S. [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	192		(484)		648		412
GMWB Reinsurance [Member] | U.S. [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	(32)		62		(92)		(81)
GMWB hedging instruments [Member] | U.S. [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	(191)		307		(540)		(261)
Macro Hedge Program [Member] | U.S. [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	(47)		6		(132)		(183)
International program hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	(516)		610		(599)		(362)
GMAB, GMWB, and GMIB Reinsurance Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	274		(359)		611		251
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ (302)		$ 485		$ (701)		$ (442)

[1] The associated liability is adjusted for changes in spot rates through realized capital gains and was $72 and $(53) for the three months ended June 30, 2013 and 2012, respectively

[2] The associated liability is adjusted for changes in spot rates through realized capital gains and was $91 and $(70) for the three months ended June 30, 2013 and 2012, respectively, and $241 and $87 for the six months ended June 30, 2013 and 2012, respectively.