Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Fixed Maturities [Member] | Available-for-sale Securities [Member]
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair value, Beginning Balance	$ 5,986		$ 7,420		$ 5,121		$ 7,489
Total realized/unrealized gains (losses) included in net income	(16)	[1],[2],[3]	6	[1],[2],[3]	(15)	[1],[2],[3]	(47)	[1],[2],[3]
Total realized/unrealized gains (losses) included in OCI	118	[4]	82	[4]	238	[4]	361	[4]
Purchases	323		60		768		79
Settlements	(125)		(146)		(256)		(268)
Sales	(246)		(327)		(348)		(540)
Transfers into Level 3	271	[5]	190	[5]	1,406	[5]	552	[5]
Transfers out of Level 3	(384)	[5]	(49)	[5]	(987)	[5]	(390)	[5]
Fair value, Ending Balance	5,927		7,236		5,927		7,236
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	(5)	[2],[6]	6	[2],[6]	(9)	[2],[6]	(47)	[2],[6]
Fixed Maturities [Member] | Available-for-sale Securities [Member] | ABS [Member]
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair value, Beginning Balance	299		446		361		477
Total realized/unrealized gains (losses) included in net income	(1)	[1],[2],[3]	(1)	[1],[2],[3]	(1)	[1],[2],[3]	(6)	[1],[2],[3]
Total realized/unrealized gains (losses) included in OCI	24	[4]	17	[4]	33	[4]	37	[4]
Purchases	25				25
Settlements	(3)		(7)		(38)		(18)
Sales	(3)		(2)		(15)		(2)
Transfers into Level 3		[5]	19	[5]		[5]	68	[5]
Transfers out of Level 3	(18)	[5]	(20)	[5]	(42)	[5]	(104)	[5]
Fair value, Ending Balance	323		452		323		452
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	(2)	[2],[6]	(1)	[2],[6]	(2)	[2],[6]	(6)	[2],[6]
Fixed Maturities [Member] | Available-for-sale Securities [Member] | CDOs [Member]
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair value, Beginning Balance	903		2,674		368		2,581
Total realized/unrealized gains (losses) included in net income	(3)	[1],[2],[3]		[1],[2],[3]	(1)	[1],[2],[3]	(15)	[1],[2],[3]
Total realized/unrealized gains (losses) included in OCI	13	[4]	10	[4]	76	[4]	123	[4]
Purchases
Settlements	(13)		(43)		(23)		(78)
Sales			(66)		(3)		(66)
Transfers into Level 3		[5]		[5]	483	[5]	30	[5]
Transfers out of Level 3		[5]		[5]		[5]		[5]
Fair value, Ending Balance	900		2,575		900		2,575
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	(3)	[2],[6]		[2],[6]	(3)	[2],[6]	(15)	[2],[6]
Fixed Maturities [Member] | Available-for-sale Securities [Member] | CMBS [Member]
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair value, Beginning Balance	1,001		741		588		689
Total realized/unrealized gains (losses) included in net income	(29)	[1],[2],[3]	13	[1],[2],[3]	(34)	[1],[2],[3]	11	[1],[2],[3]
Total realized/unrealized gains (losses) included in OCI	36	[4]	34	[4]	59	[4]	147	[4]
Purchases	1				13
Settlements	(38)		(20)		(70)		(30)
Sales	(71)		(193)		(71)		(315)
Transfers into Level 3	151	[5]	79	[5]	601	[5]	152	[5]
Transfers out of Level 3	(65)	[5]		[5]	(100)	[5]		[5]
Fair value, Ending Balance	986		654		986		654
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30		[2],[6]	13	[2],[6]	(1)	[2],[6]	11	[2],[6]
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Corporate [Member]
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair value, Beginning Balance	1,994		2,096		2,255		2,129
Total realized/unrealized gains (losses) included in net income		[1],[2],[3]	(6)	[1],[2],[3]	(3)	[1],[2],[3]	(28)	[1],[2],[3]
Total realized/unrealized gains (losses) included in OCI	(13)	[4]	27	[4]	(3)	[4]	19	[4]
Purchases	31		35		165		52
Settlements	(33)		(42)		(53)		(73)
Sales	(1)		(61)		(54)		(134)
Transfers into Level 3	120	[5]	78	[5]	322	[5]	273	[5]
Transfers out of Level 3	(293)	[5]	(17)	[5]	(824)	[5]	(128)	[5]
Fair value, Ending Balance	1,805		2,110		1,805		2,110
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30		[2],[6]	(6)	[2],[6]		[2],[6]	(28)	[2],[6]
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Foreign govt./govt. agencies [Member]
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair value, Beginning Balance	55		63		49		56
Total realized/unrealized gains (losses) included in net income		[1],[2],[3]		[1],[2],[3]		[1],[2],[3]		[1],[2],[3]
Total realized/unrealized gains (losses) included in OCI	2	[4]	1	[4]	2	[4]	1	[4]
Purchases					7		2
Settlements	(1)		(1)		(2)		(2)
Sales	(1)		(3)		(1)		(5)
Transfers into Level 3		[5]		[5]		[5]	11	[5]
Transfers out of Level 3		[5]	(9)	[5]		[5]	(12)	[5]
Fair value, Ending Balance	55		51		55		51
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30		[2],[6]		[2],[6]		[2],[6]		[2],[6]
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Municipal [Member]
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair value, Beginning Balance	625		276		437		272
Total realized/unrealized gains (losses) included in net income		[1],[2],[3]		[1],[2],[3]		[1],[2],[3]		[1],[2],[3]
Total realized/unrealized gains (losses) included in OCI	35	[4]	9	[4]	24	[4]	9	[4]
Purchases	63				275
Settlements
Sales	(65)		(2)		(65)		(2)
Transfers into Level 3		[5]		[5]		[5]	4	[5]
Transfers out of Level 3	(8)	[5]	(3)	[5]	(21)	[5]	(3)	[5]
Fair value, Ending Balance	650		280		650		280
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30		[2],[6]		[2],[6]		[2],[6]		[2],[6]
Fixed Maturities [Member] | Available-for-sale Securities [Member] | RMBS [Member]
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair value, Beginning Balance	1,109		1,124		1,063		1,285
Total realized/unrealized gains (losses) included in net income	17	[1],[2],[3]		[1],[2],[3]	24	[1],[2],[3]	(9)	[1],[2],[3]
Total realized/unrealized gains (losses) included in OCI	21	[4]	(16)	[4]	47	[4]	25	[4]
Purchases	203		25		283		25
Settlements	(37)		(33)		(70)		(67)
Sales	(105)				(139)		(16)
Transfers into Level 3		[5]	14	[5]		[5]	14	[5]
Transfers out of Level 3		[5]		[5]		[5]	(143)	[5]
Fair value, Ending Balance	1,208		1,114		1,208		1,114
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30		[2],[6]		[2],[6]	(3)	[2],[6]	(9)	[2],[6]
Fixed Maturities, FVO [Member]
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair value, Beginning Balance	508		579		495		522
Total realized/unrealized gains (losses) included in net income	(6)	[1],[2],[3]	(22)	[1],[2],[3]	21	[1],[2],[3]	36	[1],[2],[3]
Total realized/unrealized gains (losses) included in OCI		[4]		[4]		[4]		[4]
Purchases
Settlements			(1)				(2)
Sales	(9)				(23)
Transfers into Level 3		[5]		[5]		[5]		[5]
Transfers out of Level 3		[5]		[5]		[5]		[5]
Fair value, Ending Balance	493		556		493		556
Changes in unrealized gains (losses) included in net income related to financial instruments still held at June 30	$ 20	[2],[6]	$ (22)	[2],[6]	$ 35	[2],[6]	$ 36	[2],[6]

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

[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] 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.

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

[5] 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.

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