Fair Value Measurements - Guaranteed Living Benefits (Details 6) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Variable Annuity Hedging Derivatives Levels 1 and 2 [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	$ (142)	$ (166)	$ (133)	$ (184)
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	(17)	208	(125)	123
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value		(133)		(30)
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	40		139
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	(119)	(91)	(119)	(91)
Variable Annuity Hedging Derivatives Level 3 [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	488	311	600	236
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	60	617	(59)	539
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value				153
Issuances Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value			23
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value			(16)
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	548	928	548	928
Changes in Unrealized gains (losses) included in net income related to Financial Instruments Related to Guaranteed Living Benefits still held at reporting date	52	617	(61)	502
Variable Annuity Hedging Derivatives [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	346	145	467	52
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	43	825	(184)	662
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value		(133)		123
Issuances Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value			23
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	40		123
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	429	837	429	837
U S Guaranteed Withdrawal Benefits Level 3 [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	(1,301)	(1,655)	(1,611)	(1,957)
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	(80)	(1,458)	268	(1,120)
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value		(35)		(71)
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	(39)		(77)
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	(1,420)	(3,148)	(1,420)	(3,148)
Changes in Unrealized gains (losses) included in net income related to Financial Instruments Related to Guaranteed Living Benefits still held at reporting date	(80)	(1,458)	268	(1,120)
International Guaranteed Withdrawal Benefits Level 3 [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	(23)	(31)	(36)	(45)
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	(4)	(39)	11	(24)
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in OCI		(1)
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value		(1)		(3)
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	(3)		(5)
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	(30)	(72)	(30)	(72)
Changes in Unrealized gains (losses) included in net income related to Financial Instruments Related to Guaranteed Living Benefits still held at reporting date	(4)	(39)	11	(24)
Guaranteed Withdrawal Benefits Net of Reinsurance and Hedging Derivatives [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	(754)	(1,246)	(900)	(1,603)
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	(37)	(426)	34	(297)
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in OCI		(1)
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value		(160)		67
Purchases Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value			23
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	7		59
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	(784)	(1,833)	(784)	(1,833)
Macro hedge program Level 1 and 2 [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	(92)	54	176	28
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	53	117	(221)	92
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value		19		70
Purchases Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	99		99
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	154		160
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	214	190	214	190
Macro hedge program Level 3 [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	125	151	208	290
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	(18)	280	(101)	141
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value		232		232
Purchases Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	185		185
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	(35)		(35)
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	257	663	257	663
Changes in Unrealized gains (losses) included in net income related to Financial Instruments Related to Guaranteed Living Benefits still held at reporting date	(3)	300	(85)	161
Macro hedge program [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	33	205	384	318
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	35	397	(322)	233
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value		251		302
Purchases Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	284		284
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	119		125
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	471	853	471	853
International Other Guaranteed Living Benefits Level 3 [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	3	4	3	2
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	(2)	(5)	(1)	(2)
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value				(1)
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	(1)		(2)
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	0	(1)	0	(1)
Changes in Unrealized gains (losses) included in net income related to Financial Instruments Related to Guaranteed Living Benefits still held at reporting date	(2)	(5)	(1)	(2)
Reinsurance Recoverable for U.S. GMWB [Member]
Fair Value, Financial Instruments Related To Guaranteed Living Benefits Program Measured on Recurring Basis [Line Items]
Fair value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Beginning Balance	224	295	280	347
Total realized/unrealized gains (losses) on Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value, Included in net income	4	246	(61)	185
Purchases, issuances and settlements of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value		9		18
Settlements Of Financial Instruments Related To Guaranteed Living Benefits Measured At Fair Value	9		18
Fair Value of Financial Instruments Related to Guaranteed Living Benefits Measured at Fair Value on a Recurring Basis Ending Balance	237	550	237	550
Changes in Unrealized gains (losses) included in net income related to Financial Instruments Related to Guaranteed Living Benefits still held at reporting date	$ 4	$ 246	$ (61)	$ 185