Fair Value Measurements (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011		Dec. 31, 2010
Equity Securities [Member] | Available-for-sale Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)	$ 8	[1],[2]		[1],[2]	$ 8	[1],[2]	$ (10)	[1],[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	8	[2],[3],[4]		[2],[3],[4]	11	[2],[3],[4]	(10)	[2],[3],[4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	86	[5]	100	[5]	86	[5]	100	[5]	89	[5]	93	[5]	80	[5]	154	[5]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(4)	[6]	2	[6]	(4)	[6]	1	[6]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	12	[5]	24	[5]	14	[5]	37	[5]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements		[5]		[5]		[5]		[5]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	19	[5]	1	[5]	28	[5]	1	[5]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		[7]		[7]		[7]		[7]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		[7]	5	[7]		[7]	81	[7]
Freestanding Derivatives [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	417	[5]	276	[5]	724	[5]	401	[5]
Total realized/unrealized gains (losses) included in net income	231	[2],[3],[4],[5]	23	[2],[3],[4],[5]	(105)	[2],[3],[4],[5]	(171)	[2],[3],[4],[5]
Total realized/unrealized gains (losses) included in OCI	2	[5],[6]		[5],[6]	2	[5],[6]		[5],[6]
Purchases	22	[5]	185	[5]	4	[5]	273	[5]
Settlements		[5]	(38)	[5]	16	[5]	(57)	[5]
Sales		[5]		[5]		[5]		[5]
Transfers into Level 3		[5],[7]		[5],[7]		[5],[7]		[5],[7]
Transfers out of Level 3	(1)	[5],[7]		[5],[7]	30	[5],[7]		[5],[7]
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	671	[5]	446	[5]	671	[5]	446	[5]
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	228	[1],[2],[5]	28	[1],[2],[5]	(107)	[1],[2],[5]	(157)	[1],[2],[5]
Freestanding Derivatives [Member] | Hedging Derivatives [Member] | International [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	115	[5]	2	[5]	35	[5]	5	[5]
Total realized/unrealized gains (losses) included in net income	58	[2],[3],[4],[5]	(1)	[2],[3],[4],[5]	143	[2],[3],[4],[5]	(4)	[2],[3],[4],[5]
Total realized/unrealized gains (losses) included in OCI		[5],[6]		[5],[6]		[5],[6]		[5],[6]
Purchases	(12)	[5]	5	[5]	(65)	[5]	5	[5]
Settlements		[5]		[5]	40	[5]		[5]
Sales		[5]		[5]		[5]		[5]
Transfers into Level 3		[5],[7]		[5],[7]		[5],[7]		[5],[7]
Transfers out of Level 3		[5],[7]		[5],[7]	8	[5],[7]		[5],[7]
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	161	[5]	6	[5]	161	[5]	6	[5]
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	55	[1],[2],[5]	(3)	[1],[2],[5]	140	[1],[2],[5]	(5)	[1],[2],[5]
Freestanding Derivatives [Member] | US Macro Hedge Program [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance			123	[5]	357	[5]	203	[5]
Total realized/unrealized gains (losses) included in net income			(17)	[2],[3],[4],[5]	(177)	[2],[3],[4],[5]	(97)	[2],[3],[4],[5]
Total realized/unrealized gains (losses) included in OCI				[5],[6]		[5],[6]		[5],[6]
Purchases			180	[5]		[5]	180	[5]
Settlements			(35)	[5]		[5]	(35)	[5]
Sales				[5]		[5]		[5]
Transfers into Level 3				[5],[7]		[5],[7]		[5],[7]
Transfers out of Level 3				[5],[7]		[5],[7]		[5],[7]
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	180	[5]	251	[5]	180	[5]	251	[5]
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30				[1],[2],[5]	(176)	[1],[2],[5]	(80)	[1],[2],[5]
Freestanding Derivatives [Member] | US Macro Hedge Program [Member] | U.S. [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	173	[5]
Total realized/unrealized gains (losses) included in net income	7	[2],[3],[4],[5]
Total realized/unrealized gains (losses) included in OCI		[5],[6]
Purchases		[5]
Settlements		[5]
Sales		[5]
Transfers into Level 3		[5],[7]
Transfers out of Level 3		[5],[7]
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	180	[5]			180	[5]
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	7	[1],[2],[5]
Freestanding Derivatives [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | Hedging Derivatives [Member] | U.S. [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	594	[5]	488	[5]	883	[5]	600	[5]
Total realized/unrealized gains (losses) included in net income	139	[2],[3],[4],[5]	60	[2],[3],[4],[5]	(173)	[2],[3],[4],[5]	(59)	[2],[3],[4],[5]
Total realized/unrealized gains (losses) included in OCI		[5],[6]		[5],[6]		[5],[6]		[5],[6]
Purchases	23	[5]		[5]	23	[5]	23	[5]
Settlements		[5]		[5]		[5]	(16)	[5]
Sales		[5]		[5]		[5]		[5]
Transfers into Level 3		[5],[7]		[5],[7]		[5],[7]		[5],[7]
Transfers out of Level 3		[5],[7]		[5],[7]	23	[5],[7]		[5],[7]
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	756	[5]	548	[5]	756	[5]	548	[5]
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	139	[1],[2],[5]	52	[1],[2],[5]	(173)	[1],[2],[5]	(61)	[1],[2],[5]
Freestanding Derivatives [Member] | Credit derivative [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	(474)	[5]	(382)	[5]	(561)	[5]	(390)	[5]
Total realized/unrealized gains (losses) included in net income	36	[2],[3],[4],[5]	(17)	[2],[3],[4],[5]	128	[2],[3],[4],[5]	(6)	[2],[3],[4],[5]
Total realized/unrealized gains (losses) included in OCI		[5],[6]		[5],[6]		[5],[6]		[5],[6]
Purchases		[5]		[5]		[5]	1	[5]
Settlements		[5]	(3)	[5]	(5)	[5]	(7)	[5]
Sales		[5]		[5]		[5]		[5]
Transfers into Level 3		[5],[7]		[5],[7]		[5],[7]		[5],[7]
Transfers out of Level 3	(1)	[5],[7]		[5],[7]	(1)	[5],[7]		[5],[7]
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	(439)	[5]	(402)	[5]	(439)	[5]	(402)	[5]
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	36	[1],[2],[5]	(19)	[1],[2],[5]	116	[1],[2],[5]	(8)	[1],[2],[5]
Freestanding Derivatives [Member] | Equity derivative [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	39	[5]	5	[5]	40	[5]	4	[5]
Total realized/unrealized gains (losses) included in net income	3	[2],[3],[4],[5]	1	[2],[3],[4],[5]	(14)	[2],[3],[4],[5]	2	[2],[3],[4],[5]
Total realized/unrealized gains (losses) included in OCI		[5],[6]		[5],[6]		[5],[6]		[5],[6]
Purchases	11	[5]		[5]	46	[5]		[5]
Settlements		[5]		[5]	(19)	[5]		[5]
Sales		[5]		[5]		[5]		[5]
Transfers into Level 3		[5],[7]		[5],[7]		[5],[7]		[5],[7]
Transfers out of Level 3		[5],[7]		[5],[7]		[5],[7]		[5],[7]
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	53	[5]	6	[5]	53	[5]	6	[5]
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	3	[1],[2],[5]	1	[1],[2],[5]	(2)	[1],[2],[5]	2	[1],[2],[5]
Freestanding Derivatives [Member] | Interest rate derivatives [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	(57)	[5]	9	[5]	(58)	[5]	(53)	[5]
Total realized/unrealized gains (losses) included in net income	(11)	[2],[3],[4],[5]	(2)	[2],[3],[4],[5]	(10)	[2],[3],[4],[5]	(5)	[2],[3],[4],[5]
Total realized/unrealized gains (losses) included in OCI	2	[5],[6]		[5],[6]	2	[5],[6]		[5],[6]
Purchases		[5]		[5]		[5]	64	[5]
Settlements		[5]		[5]		[5]	1	[5]
Sales		[5]		[5]		[5]		[5]
Transfers into Level 3		[5],[7]		[5],[7]		[5],[7]		[5],[7]
Transfers out of Level 3		[5],[7]		[5],[7]		[5],[7]		[5],[7]
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	(66)	[5]	7	[5]	(66)	[5]	7	[5]
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	(11)	[1],[2],[5]	(2)	[1],[2],[5]	(10)	[1],[2],[5]	(3)	[1],[2],[5]
Freestanding Derivatives [Member] | Other Derivatives Contracts [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	27	[5]	31	[5]	28	[5]	32	[5]
Total realized/unrealized gains (losses) included in net income	(1)	[2],[3],[4],[5]	(1)	[2],[3],[4],[5]	(2)	[2],[3],[4],[5]	(2)	[2],[3],[4],[5]
Total realized/unrealized gains (losses) included in OCI		[5],[6]		[5],[6]		[5],[6]		[5],[6]
Purchases		[5]		[5]		[5]		[5]
Settlements		[5]		[5]		[5]		[5]
Sales		[5]		[5]		[5]		[5]
Transfers into Level 3		[5],[7]		[5],[7]		[5],[7]		[5],[7]
Transfers out of Level 3		[5],[7]		[5],[7]		[5],[7]		[5],[7]
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	26	[5]	30	[5]	26	[5]	30	[5]
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	$ (1)	[1],[2],[5]	$ (1)	[1],[2],[5]	$ (2)	[1],[2],[5]	$ (2)	[1],[2],[5]

[1] Amounts presented are for Level 3 only and therefore may not agree to other disclosures included herein.

[2] All amounts in these rows are reported in net realized capital gains/losses. The realized/unrealized gains (losses) included in net income for separate account assets are offset by an equal amount for separate account liabilities, which results in a net zero impact on net income for the Company. All amounts are before income taxes and amortization DAC.

[3] Includes both market and non-market impacts in deriving realized and unrealized gains (losses).

[4] The Company classifies gains and losses on GMWB reinsurance derivatives and Guaranteed Living Benefit embedded derivatives as unrealized gains (losses) for purposes of disclosure in this table because it is impracticable to track on a contract-by-contract basis the realized gains (losses) for these derivatives and embedded derivatives.

[5] Derivative instruments are reported in this table on a net basis for asset/(liability) positions and reported in the Condensed Consolidated Balance Sheet in other investments and other liabilities.

[6] All amounts are before income taxes and amortization of DAC.

[7] Transfers in and/or (out) of Level 3 are primarily attributable to the availability of market observable information and the re-evaluation of the observability of pricing inputs.