Investments and Derivative Instruments Level 4 Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		$ 62,185	$ 72,850
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		1,100
Derivative, Fair Value, Net		(926)	(639)
Derivative Asset, Fair Value, Gross Asset		933	1,175
Derivative Liability, Fair Value, Gross Liability		1,730	1,741
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		1,095	1,267
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		2,021	1,906
Fixed Maturities [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		425	454
Derivative, Fair Value, Net		(3)	2
Derivative Asset, Fair Value, Gross Asset		0	2
Derivative Liability, Fair Value, Gross Liability		3	0
Other Investments [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		23,253	23,014
Derivative, Fair Value, Net		1	364
Derivative Asset, Fair Value, Gross Asset		409	624
Derivative Liability, Fair Value, Gross Liability		408	260
Other Liabilities [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		19,358	26,791
Derivative, Fair Value, Net		(798)	(930)
Derivative Asset, Fair Value, Gross Asset		524	551
Derivative Liability, Fair Value, Gross Liability		1,322	1,481
Reinsurance Recoverable [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		4,000	4,633
Derivative, Fair Value, Net		162	90
Derivative Asset, Fair Value, Gross Asset		162	90
Derivative Liability, Fair Value, Gross Liability		0	0
Other Policyholder Funds and Benefits Payable [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		15,149	17,958
Derivative, Fair Value, Net		(288)	(165)
Derivative Asset, Fair Value, Gross Asset		0	0
Derivative Liability, Fair Value, Gross Liability		288	165
Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		58,492	68,676
Derivative, Fair Value, Net		(924)	(664)
Derivative Asset, Fair Value, Gross Asset		1,038	1,212
Derivative Liability, Fair Value, Gross Liability		1,962	1,876
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		14,290	15,254
Derivative, Fair Value, Net		(814)	(512)
Derivative Asset, Fair Value, Gross Asset		297	536
Derivative Liability, Fair Value, Gross Liability		1,111	1,048
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		653	177
Derivative, Fair Value, Net		17	1
Derivative Asset, Fair Value, Gross Asset		17	3
Derivative Liability, Fair Value, Gross Liability		0	2
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount	[1]	2,458	1,487
Derivative, Fair Value, Net	[1]	(13)	3
Derivative Asset, Fair Value, Gross Asset	[1]	9	14
Derivative Liability, Fair Value, Gross Liability	[1]	22	11
Cash Flow Hedging [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		3,670	4,142
Derivative, Fair Value, Net		(2)	25
Derivative Asset, Fair Value, Gross Asset		57	55
Derivative Liability, Fair Value, Gross Liability		59	30
Fair Value Hedging [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		23	32
Derivative, Fair Value, Net		0	0
Derivative Asset, Fair Value, Gross Asset		0	0
Derivative Liability, Fair Value, Gross Liability		0	0
Credit Default Swap, Buying Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		423	595
Derivative, Fair Value, Net		18	(6)
Derivative Asset, Fair Value, Gross Asset		22	4
Derivative Liability, Fair Value, Gross Liability		4	10
Credit Derivatives in Offsetting Positions [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		4,059	5,343
Derivative, Fair Value, Net		(2)	(3)
Derivative Asset, Fair Value, Gross Asset		40	53
Derivative Liability, Fair Value, Gross Liability		42	56
Put Option [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		500	500
Derivative, Fair Value, Net		7	12
Derivative Asset, Fair Value, Gross Asset		7	12
Derivative Liability, Fair Value, Gross Liability		0	0
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		895	974
Derivative, Fair Value, Net		79	34
Derivative Asset, Fair Value, Gross Asset		79	34
Derivative Liability, Fair Value, Gross Liability		0	0
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		419	635
Derivative, Fair Value, Net		15	2
Derivative Asset, Fair Value, Gross Asset		41	31
Derivative Liability, Fair Value, Gross Liability		26	29
JAPAN | Three Win Related Foreign Currency Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		1,063	1,319
Derivative, Fair Value, Net		(357)	(427)
Derivative Asset, Fair Value, Gross Asset		0	0
Derivative Liability, Fair Value, Gross Liability		357	427
UNITED STATES | GMWB Hedging Instruments [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		10,979	14,442
Derivative, Fair Value, Net		158	174
UNITED STATES | GMWB Hedging Instruments [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		10,979	14,442
Derivative, Fair Value, Net		158	174
Derivative Asset, Fair Value, Gross Asset		264	289
Derivative Liability, Fair Value, Gross Liability		106	115
UNITED STATES | Macro Hedge Program [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		4,548	6,383
Derivative, Fair Value, Net		147	141
Derivative Asset, Fair Value, Gross Asset		179	180
Derivative Liability, Fair Value, Gross Liability		32	39
UNITED STATES | Interest Rate Contract [Member] | GMWB Hedging Instruments [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		3,740	3,640
Derivative, Fair Value, Net		25	11
UNITED STATES | GMWB Product Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount	[2]	15,099	17,908
Derivative, Fair Value, Net	[2]	(262)	(139)
Derivative Asset, Fair Value, Gross Asset	[2]	0	0
Derivative Liability, Fair Value, Gross Liability	[2]	262	139
UNITED STATES | GMWB Reinsurance [Member] | Not Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		3,106	3,659
Derivative, Fair Value, Net		83	56
Derivative Asset, Fair Value, Gross Asset		83	56
Derivative Liability, Fair Value, Gross Liability		0	0
UNITED STATES | Equity Contract [Member] | GMWB Hedging Instruments [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		1,362	3,761
Derivative, Fair Value, Net		2	39
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		143	143
Derivative, Fair Value, Net		(19)	(19)
Derivative Asset, Fair Value, Gross Asset		7	3
Derivative Liability, Fair Value, Gross Liability		26	22
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		3,527	3,999
Derivative, Fair Value, Net		17	44
Derivative Asset, Fair Value, Gross Asset		50	52
Derivative Liability, Fair Value, Gross Liability		33	8
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivative Balance Sheet Location [Line Items]
Derivative, Notional Amount		23	32
Derivative, Fair Value, Net		0	0
Derivative Asset, Fair Value, Gross Asset		0	0
Derivative Liability, Fair Value, Gross Liability		$ 0	$ 0

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

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