Derivatives Instruments Level 4 Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ 809	$ 963
Derivative, Notional Amount	52,286	56,216
Derivative, Fair Value, Net	(498)	(1,001)
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	1,199	976
Derivative Asset, Fair Value, Gross Asset	1,091	834
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	1,006	670
Derivative, Collateral, Obligation to Return Cash	(118)	(344)
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1,697)	(1,977)
Derivative Asset, Fair Value of Collateral	42	103
Derivative Asset, Fair Value, Amount Offset Against Collateral	43	61
Derivative Liability, Fair Value, Gross Liability	(1,604)	(1,703)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	703	884
Derivative, Collateral, Right to Reclaim Cash	185	130
Derivative Liability, Fair Value of Collateral	888	763
Derivative Liability, Fair Value, Amount Offset Against Collateral	13	56
Fixed Maturities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	156	322
Derivative, Fair Value, Net	0	1
Derivative Asset, Fair Value, Gross Asset	0	1
Derivative Liability, Fair Value, Gross Liability	0	0
Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	12,797	23,620
Derivative, Fair Value, Net	203	(180)
Derivative Asset, Fair Value, Gross Asset	281	377
Derivative Liability, Fair Value, Gross Liability	(78)	(557)
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	24,203	15,526
Derivative, Fair Value, Net	(716)	(689)
Derivative Asset, Fair Value, Gross Asset	810	457
Derivative Liability, Fair Value, Gross Liability	(1,526)	(1,146)
Reinsurance Recoverable [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,333	3,584
Derivative, Fair Value, Net	108	141
Derivative Asset, Fair Value, Gross Asset	108	141
Derivative Liability, Fair Value, Gross Liability	0	0
Other Policyholder Funds and Benefits Payable [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	11,797	13,164
Derivative, Fair Value, Net	(93)	(274)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(93)	(274)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	48,132	52,537
Derivative, Fair Value, Net	(479)	(907)
Derivative Asset, Fair Value, Gross Asset	1,114	954
Derivative Liability, Fair Value, Gross Liability	(1,593)	(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	(716)	(689)
Derivative Financial Instruments, Assets [Member] \| Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	203	(180)
Interest Rate Contract [Member] \| Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	2	(427)
Interest Rate Contract [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(479)	(542)
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	11,228	11,743
Derivative, Fair Value, Net	(476)	(890)
Derivative Asset, Fair Value, Gross Asset	634	264
Derivative Liability, Fair Value, Gross Liability	(1,110)	(1,154)
Interest Rate Contract [Member] \| Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,855	3,440
Derivative, Fair Value, Net	(1)	(79)
Derivative Asset, Fair Value, Gross Asset	79	11
Derivative Liability, Fair Value, Gross Liability	(80)	(90)
Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,154	3,679
Derivative, Fair Value, Net	(19)	(94)
Derivative Asset, Fair Value, Gross Asset	85	22
Derivative Liability, Fair Value, Gross Liability	(104)	(116)
Currency Swap [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	165	1,064
Derivative, Fair Value, Net	(1)	68
Derivative Asset, Fair Value, Gross Asset	0	70
Derivative Liability, Fair Value, Gross Liability	(1)	(2)
Currency Swap [Member] \| Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	299	239
Derivative, Fair Value, Net	(18)	(15)
Derivative Asset, Fair Value, Gross Asset	6	11
Derivative Liability, Fair Value, Gross Liability	(24)	(26)
Three Win Related Foreign Currency Swaps [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	804	804
Derivative, Fair Value, Net	(255)	(263)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(255)	(263)
Credit Default Swap, Buying Protection [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	144	209
Derivative, Fair Value, Net	(3)	(4)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(3)	(4)
Credit Default Swap, Selling Protection [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,105	1,309
Derivative, Fair Value, Net	4	10
Derivative Asset, Fair Value, Gross Asset	23	15
Derivative Liability, Fair Value, Gross Liability	(19)	(5)
Credit Derivatives in Offsetting Positions [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,842	3,317
Derivative, Fair Value, Net	4	(1)
Derivative Asset, Fair Value, Gross Asset	25	39
Derivative Liability, Fair Value, Gross Liability	(21)	(40)
Equity Contract [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	2	33
Equity Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	167	105
Derivative, Fair Value, Net	2	0
Derivative Asset, Fair Value, Gross Asset	2	33
Derivative Liability, Fair Value, Gross Liability	0	(33)
Equity Contract [Member] \| Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(41)	(27)
GMWB Product Derivatives [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	11,797	13,114
Derivative, Fair Value, Net	(93)	(241)
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(93)	(241)
GMWB Reinsurance [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,450	2,709
Derivative, Fair Value, Net	51	73
Derivative Asset, Fair Value, Gross Asset	51	73
Derivative Liability, Fair Value, Gross Liability	0	0
GMWB Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,391	10,256
Derivative, Fair Value, Net	65	94
GMWB Hedging Instruments [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,391	10,256
Derivative, Fair Value, Net	65	94
Derivative Asset, Fair Value, Gross Asset	130	190
Derivative Liability, Fair Value, Gross Liability	(65)	(96)
Macro Hedge Program [Member] \| Other Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	158	128
Macro Hedge Program [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	8	50
Macro Hedge Program [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	8,157	6,532
Derivative, Fair Value, Net	166	178
Derivative Asset, Fair Value, Gross Asset	192	201
Derivative Liability, Fair Value, Gross Liability	(26)	(23)
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	57	68
Derivative Asset, Fair Value, Gross Asset	57	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	$ 882	$ 875

Amount of invested assets supporting other policyholder fund liabilities under a modified coinsurance agreement.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-Publisher SEC
-Name Regulation S-X (SX)
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-Article 12
-Section 13
-Sentence Column B

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements.

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Fair value of securities received as collateral against derivative assets.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after effects of master netting arrangements, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and right to receive cash collateral under master netting arrangements.

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