Derivatives Instruments Level 4 Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ 877	$ 963
Derivative, Notional Amount	54,221	56,216
Derivative, Fair Value, Net	(501)	(1,001)
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	1,343	976
Derivative Asset, Fair Value, Gross Asset	1,217	834
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	1,101	670
Derivative, Collateral, Obligation to Return Cash	(134)	(344)
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1,844)	(1,977)
Derivative Asset, Fair Value of Collateral	73	103
Derivative Asset, Fair Value, Amount Offset Against Collateral	43	61
Derivative Liability, Fair Value, Gross Liability	(1,650)	(1,703)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	820	884
Derivative, Collateral, Right to Reclaim Cash	147	130
Derivative Liability, Fair Value of Collateral	811	763
Derivative Liability, Fair Value, Amount Offset Against Collateral	19	56
Other Policyholder Funds and Benefits Payable [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	12,681	13,164
Derivative, Fair Value, Net	(194)	(274)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(194)	(274)
Reinsurance Recoverable [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,491	3,584
Derivative, Fair Value, Net	126	141
Derivative Asset, Fair Value, Gross Asset	126	141
Derivative Liability, Fair Value, Gross Liability	0	0
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	14,036	15,526
Derivative, Fair Value, Net	(683)	(689)
Derivative Asset, Fair Value, Gross Asset	396	457
Derivative Liability, Fair Value, Gross Liability	(1,079)	(1,146)
Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	23,717	23,620
Derivative, Fair Value, Net	250	(180)
Derivative Asset, Fair Value, Gross Asset	821	377
Derivative Liability, Fair Value, Gross Liability	(571)	(557)
Fixed Maturities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	296	322
Derivative, Fair Value, Net	0	1
Derivative Asset, Fair Value, Gross Asset	0	1
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	50,502	52,537
Derivative, Fair Value, Net	(492)	(907)
Derivative Asset, Fair Value, Gross Asset	1,235	954
Derivative Liability, Fair Value, Gross Liability	(1,727)	(1,861)
Put Option [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	0	500
Derivative, Fair Value, Net	0	1
Derivative Asset, Fair Value, Gross Asset	0	1
Derivative Liability, Fair Value, Gross Liability	0	0
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(683)	(689)
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	250	(180)
Foreign Exchange Contract [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(262)
Foreign Exchange Contract [Member] | Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	3	27
Interest Rate Contract [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(517)
Interest Rate Contract [Member] | Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	48	(427)
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	11,080	11,743
Derivative, Fair Value, Net	(474)	(890)
Derivative Asset, Fair Value, Gross Asset	648	264
Derivative Liability, Fair Value, Gross Liability	(1,122)	(1,154)
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,480	3,440
Derivative, Fair Value, Net	5	(79)
Derivative Asset, Fair Value, Gross Asset	97	11
Derivative Liability, Fair Value, Gross Liability	(92)	(90)
Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,719	3,679
Derivative, Fair Value, Net	(9)	(94)
Derivative Asset, Fair Value, Gross Asset	108	22
Derivative Liability, Fair Value, Gross Liability	(117)	(116)
Currency Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	307	1,064
Derivative, Fair Value, Net	(3)	68
Derivative Asset, Fair Value, Gross Asset	0	70
Derivative Liability, Fair Value, Gross Liability	(3)	(2)
Currency Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	239	239
Derivative, Fair Value, Net	(14)	(15)
Derivative Asset, Fair Value, Gross Asset	11	11
Derivative Liability, Fair Value, Gross Liability	(25)	(26)
ERROR in label resolution. | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	804	804
Derivative, Fair Value, Net	(242)	(263)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(242)	(263)
Credit Default Swap, Buying Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	159	209
Derivative, Fair Value, Net	(4)	(4)
Derivative Asset, Fair Value, Gross Asset	1	0
Derivative Liability, Fair Value, Gross Liability	(5)	(4)
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,904	1,309
Derivative, Fair Value, Net	0	10
Derivative Asset, Fair Value, Gross Asset	26	15
Derivative Liability, Fair Value, Gross Liability	(26)	(5)
Credit Derivatives in Offsetting Positions [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,128	3,317
Derivative, Fair Value, Net	3	(1)
Derivative Asset, Fair Value, Gross Asset	36	39
Derivative Liability, Fair Value, Gross Liability	(33)	(40)
Equity Contract [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	37
Equity Contract [Member] | Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	4
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	339	105
Derivative, Fair Value, Net	5	0
Derivative Asset, Fair Value, Gross Asset	41	33
Derivative Liability, Fair Value, Gross Liability	(36)	(33)
Equity Contract [Member] | Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(35)	(27)
GMWB Product Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	12,631	13,114
Derivative, Fair Value, Net	(157)	(241)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(157)	(241)
GMWB Reinsurance [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,616	2,709
Derivative, Fair Value, Net	60	73
Derivative Asset, Fair Value, Gross Asset	60	73
Derivative Liability, Fair Value, Gross Liability	0	0
ERROR in label resolution.
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,937	10,256
Derivative, Fair Value, Net	83	94
ERROR in label resolution. | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,937	10,256
Derivative, Fair Value, Net	83	94
Derivative Asset, Fair Value, Gross Asset	171	190
Derivative Liability, Fair Value, Gross Liability	(88)	(96)
Macro Hedge Program [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	58	50
Macro Hedge Program [Member] | Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	113	128
Macro Hedge Program [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,722	6,532
Derivative, Fair Value, Net	171	178
Derivative Asset, Fair Value, Gross Asset	186	201
Derivative Liability, Fair Value, Gross Liability	(15)	(23)
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	66	68
Derivative Asset, Fair Value, Gross Asset	66	68
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]
Invested Assets Suppoting Modco	$ 875	$ 875