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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.

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