Investments and Derivative Instruments Level 4 Derivative Balance Sheet Classification (Details) - Fair Value Hierarchy [Domain] - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014		Mar. 31, 2013
Derivative Balance Sheet Location [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset		$ 30	$ 33
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		49,064	55,838		$ 55,838
Derivative, Fair Value, Net		(446)	(460)
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		973	1,050
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		1,419	1,510
Derivative Asset, Fair Value, Gross Asset		863	959
Derivative Liability, Fair Value, Gross Liability		(1,280)	(1,345)
Offsetting Derivative Assets [Abstract]
Derivative Asset, Fair Value, Amount Offset Against Collateral		712	801
Derivative Accrued Interest and Collateral Assets After Offsetting		(160)	(181)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		80	83
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Amount Offset Against Collateral		(494)	(574)
Derivative Accrued Interest and Collateral Liabilities After Offsetting		(61)	(49)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		(936)	(900)
Derivative Asset, Fair Value, Amount Offset Against Collateral		71	75
Derivative Liability, Fair Value, Amount Offset Against Collateral		150	129
Fixed Maturities [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative Asset, Fair Value, Gross Asset		0	1
Not Designated as Hedging Instrument [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		46,685	53,421
Derivative, Fair Value, Net		(460)	(478)
Derivative Asset, Fair Value, Gross Asset		935	1,010
Derivative Liability, Fair Value, Gross Liability		(1,395)	(1,488)
Interest Rate Contract [Member] | Other Liabilities [Member]
Offsetting Derivative Assets [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net		(371)
Interest Rate Contract [Member] | Other Investments [Member]
Offsetting Derivative Assets [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net		101	123
Foreign Exchange Contract [Member] | Other Liabilities [Member]
Offsetting Derivative Assets [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net		(479)
Foreign Exchange Contract [Member] | Other Investments [Member]
Offsetting Derivative Assets [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net		2	(1)
Embedded Derivative Financial Instruments [Member] | Other Liabilities [Member]
Offsetting Derivative Assets [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net		(3)	(3)	[1]
Derivative Financial Instruments, Liabilities [Member]
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Amount Offset Against Collateral		280	399
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member]
Offsetting Derivative Assets [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net		(725)	(722)	[2]
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]
Offsetting Derivative Assets [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net		311	339	[3]
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		921	974
Derivative, Fair Value, Net		60	34
Derivative Asset, Fair Value, Gross Asset		60	34
Derivative Liability, Fair Value, Gross Liability		0	0
Credit Default Swap, Selling Protection [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount	[4]	1,398	946
Derivative, Fair Value, Net	[4]	3	7
Derivative Asset, Fair Value, Gross Asset	[4]	14	11
Derivative Liability, Fair Value, Gross Liability	[4]	(11)	(4)
Equity Contract [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		120	422
Derivative, Fair Value, Net		(1)	1
Derivative Asset, Fair Value, Gross Asset		28	30
Derivative Liability, Fair Value, Gross Liability		(29)	(29)
Commodity Option [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		378	0
Derivative, Fair Value, Net		2	0
Derivative Asset, Fair Value, Gross Asset		2	0
Derivative Liability, Fair Value, Gross Liability		0	0
Other Investments [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		13,198	13,588
Derivative, Fair Value, Net		311	339
Derivative Asset, Fair Value, Gross Asset		429	478
Derivative Liability, Fair Value, Gross Liability		(118)	(139)
Other Liabilities [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		14,984	19,473
Derivative, Fair Value, Net		(728)	(725)
Derivative Asset, Fair Value, Gross Asset		434	481
Derivative Liability, Fair Value, Gross Liability		(1,162)	(1,206)
Foreign Exchange Contract [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Fair Value, Net		(20)
Cash Flow Hedging [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		2,330	2,385
Derivative, Fair Value, Net		14	18
Derivative Asset, Fair Value, Gross Asset		38	40
Derivative Liability, Fair Value, Gross Liability		(24)	(22)
Fair Value Hedging [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		49	32
Derivative, Fair Value, Net		0	0
Derivative Asset, Fair Value, Gross Asset		0	0
Derivative Liability, Fair Value, Gross Liability		0	0
Currency Swap [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		65	60
Derivative, Fair Value, Net		1	0
Derivative Asset, Fair Value, Gross Asset		1	0
Derivative Liability, Fair Value, Gross Liability		0	0
Credit Default Swap, Buying Protection [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		66	276
Derivative, Fair Value, Net		1	(1)
Derivative Asset, Fair Value, Gross Asset		2	4
Derivative Liability, Fair Value, Gross Liability		(1)	(5)
Credit Derivatives in Offsetting Positions [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		1,506	2,175
Derivative, Fair Value, Net		(1)	(1)
Derivative Asset, Fair Value, Gross Asset		18	21
Derivative Liability, Fair Value, Gross Liability		(19)	(22)
Reinsurance Recoverable [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		4,287	4,633
Derivative, Fair Value, Net		110	90
Derivative Asset, Fair Value, Gross Asset		110	90
Derivative Liability, Fair Value, Gross Liability		0	0
Other Policyholder Funds and Benefits Payable [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		16,411	17,958
Derivative, Fair Value, Net		(138)	(165)
Derivative Asset, Fair Value, Gross Asset		0	0
Derivative Liability, Fair Value, Gross Liability		(138)	(165)
Fixed Maturities [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		184	186
Derivative, Fair Value, Net		(1)	1
Derivative Liability, Fair Value, Gross Liability		(1)	0
JAPAN | Three Win Related Foreign Currency Swaps [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		1,319	1,319
Derivative, Fair Value, Net		(458)	(427)
Derivative Asset, Fair Value, Gross Asset		0	0
Derivative Liability, Fair Value, Gross Liability		(458)	(427)
UNITED STATES | GMWB Hedging Instruments [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		11,732	14,442
Derivative, Fair Value, Net		134	174
Derivative Asset, Fair Value, Gross Asset		246	289
Derivative Liability, Fair Value, Gross Liability		(112)	(115)
UNITED STATES | Macro Hedge Program [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		4,591	6,383
Derivative, Fair Value, Net		165	141
Derivative Asset, Fair Value, Gross Asset		200	180
Derivative Liability, Fair Value, Gross Liability		(35)	(39)
UNITED STATES | Equity Contract [Member] | GMWB Hedging Instruments [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		1,719	3,761
Derivative, Fair Value, Net		10	39
UNITED STATES | Macro Hedge Program [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		4,591	6,383
Derivative, Fair Value, Net		165	141
UNITED STATES | Macro Hedge Program [Member] | Other Liabilities [Member]
Offsetting Derivative Assets [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net		65	48
UNITED STATES | Macro Hedge Program [Member] | Other Investments [Member]
Offsetting Derivative Assets [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net		100	93
UNITED STATES | GMWB Product Derivatives [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount	[5]	16,361	17,908
Derivative, Fair Value, Net	[5]	(112)	(139)
Derivative Asset, Fair Value, Gross Asset	[5]	0	0
Derivative Liability, Fair Value, Gross Liability	[5]	(112)	(139)
UNITED STATES | GMWB Reinsurance [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		3,366	3,659
Derivative, Fair Value, Net		50	56
Derivative Asset, Fair Value, Gross Asset		50	56
Derivative Liability, Fair Value, Gross Liability		0	0
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		2,187	2,242
Derivative, Fair Value, Net		34	37
Derivative Asset, Fair Value, Gross Asset		34	37
Derivative Liability, Fair Value, Gross Liability		0	0
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Footnote [Abstract]
Derivative, Notional Amount		143	143
Derivative, Fair Value, Net		4	(19)
Derivative Asset, Fair Value, Gross Asset			3
Derivative Liability, Fair Value, Gross Liability		$ (24)	$ (22)

[1] Represents embedded derivatives associated with non-funding agreement-backed consumer equity-linked notes.

[2] Includes OTC and OTC-cleared derivative instruments in a net negative fair market value position (derivative liability) after consideration of the accrued interest and impact of collateral posting requirements which may be imposed by agreements, clearing house rules and applicable law. In the following Level 3 roll-forward table in this Note 2, the derivative assets and liabilities are referred to as “freestanding derivatives” and are presented on a net basis.

[3] Includes over-the-counter ("OTC") and OTC-cleared derivative instruments in a net positive fair value position after consideration of the accrued interest and impact of collateral posting requirements which may be imposed by agreements, clearing house rules and applicable law. As of June 30, 2015 and December 31, 2014, $280 and $399, respectively, of cash collateral liability was netted against the derivative asset value in the Condensed Consolidated Balance Sheet and is excluded from the preceding table. See the following footnote 4 for derivative liabilities.

[4] The derivative instruments related to this strategy are held for other investment purposes.

[5] These derivatives are embedded within liabilities and are not held for risk management purposes.