Derivative Instruments Level 4 Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 43,605	$ 46,241
Derivative, Fair Value, Net	(518)	(530)
Derivative Asset, Fair Value, Gross Asset	1,213	852
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	1,342	1,014
Derivative Liability, Fair Value, Gross Liability	1,481	1,255
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	1,860	1,544
Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	955	692
Derivative, Collateral, Obligation to Return Cash	18	90
Derivative Asset, Fair Value of Collateral	209	99
Derivative Asset, Fair Value, Amount Offset Against Collateral	49	61
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	653	499
Derivative, Collateral, Right to Reclaim Cash	284	103
Derivative Liability, Fair Value of Collateral	798	753
Derivative Liability, Fair Value, Amount Offset Against Collateral	30	3
Other Policyholder Funds and Benefits Payable [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	13,653	15,149
Derivative, Fair Value, Net	(379)	(288)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	379	288
Reinsurance Recoverable [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,729	4,000
Derivative, Fair Value, Net	129	162
Derivative Asset, Fair Value, Gross Asset	129	162
Derivative Liability, Fair Value, Gross Liability	0	0
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	17,703	15,071
Derivative, Fair Value, Net	(544)	(653)
Derivative Asset, Fair Value, Gross Asset	887	492
Derivative Liability, Fair Value, Gross Liability	1,431	1,145
Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	8,358	11,837
Derivative, Fair Value, Net	276	250
Derivative Asset, Fair Value, Gross Asset	326	360
Derivative Liability, Fair Value, Gross Liability	50	110
Fixed Maturities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	162	184
Derivative, Fair Value, Net	0	(1)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	0	1
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	41,661	44,309
Derivative, Fair Value, Net	(569)	(549)
Derivative Asset, Fair Value, Gross Asset	1,266	969
Derivative Liability, Fair Value, Gross Liability	1,835	1,518
Currency Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	385	386
Derivative, Fair Value, Net	(1)	4
Derivative Asset, Fair Value, Gross Asset	1	4
Derivative Liability, Fair Value, Gross Liability	2	0
Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,921	1,909
Derivative, Fair Value, Net	51	19
Derivative Asset, Fair Value, Gross Asset	76	45
Derivative Liability, Fair Value, Gross Liability	25	26
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member]
Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(544)	(653)
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]
Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	276	250
Credit Default Swap, Buying Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	107	249
Derivative, Fair Value, Net	(3)	10
Derivative Asset, Fair Value, Gross Asset	0	12
Derivative Liability, Fair Value, Gross Liability	3	2
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	658	1,435
Derivative, Fair Value, Net	(1)	(10)
Derivative Asset, Fair Value, Gross Asset	4	5
Derivative Liability, Fair Value, Gross Liability	5	15
Credit Derivatives in Offsetting Positions [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,279	1,435
Derivative, Fair Value, Net	0	(1)
Derivative Asset, Fair Value, Gross Asset	18	17
Derivative Liability, Fair Value, Gross Liability	18	18
Equity Contract [Member] | Other Liabilities [Member]
Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	30
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	100	404
Derivative, Fair Value, Net	(1)	15
Derivative Asset, Fair Value, Gross Asset	30	41
Derivative Liability, Fair Value, Gross Liability	31	26
GMWB Product Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	13,603	15,099
Derivative, Fair Value, Net	(348)	(262)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	348	262
GMWB Reinsurance [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,809	3,106
Derivative, Fair Value, Net	98	83
Derivative Asset, Fair Value, Gross Asset	98	83
Derivative Liability, Fair Value, Gross Liability	0	0
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	921	895
Derivative, Fair Value, Net	31	79
Derivative Asset, Fair Value, Gross Asset	31	79
Derivative Liability, Fair Value, Gross Liability	0	0
GMWB Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	10,464	10,979
Derivative, Fair Value, Net	169	158
GMWB Hedging Instruments [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	10,464	10,979
Derivative, Fair Value, Net	169	158
Derivative Asset, Fair Value, Gross Asset	307	264
Derivative Liability, Fair Value, Gross Liability	138	106
Interest Rate Contract [Member] | Other Liabilities [Member]
Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(451)
Interest Rate Contract [Member] | Other Investments [Member]
Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	117	54
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,924	4,710
Derivative, Fair Value, Net	(402)	(415)
Derivative Asset, Fair Value, Gross Asset	580	285
Derivative Liability, Fair Value, Gross Liability	982	700
Foreign Exchange Contract [Member] | Other Liabilities [Member]
Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(266)
Foreign Exchange Contract [Member] | Other Investments [Member]
Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	1	4
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(17)
Macro Hedge Program [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,348	4,548
Derivative, Fair Value, Net	136	147
Derivative Asset, Fair Value, Gross Asset	197	179
Derivative Liability, Fair Value, Gross Liability	61	32
Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	23	23
Derivative, Fair Value, Net	0	0
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,766	1,766
Derivative, Fair Value, Net	68	38
Derivative Asset, Fair Value, Gross Asset	68	38
Derivative Liability, Fair Value, Gross Liability	0	0
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	155	143
Derivative, Fair Value, Net		(19)
Derivative Asset, Fair Value, Gross Asset	8	7
Derivative Liability, Fair Value, Gross Liability	25	26
JAPAN | Three Win Related Foreign Currency Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,063	1,063
Derivative, Fair Value, Net	(247)	(357)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	$ 247	$ 357