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Investments and Derivative Instruments Level 4 Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Derivative Balance Sheet Classification [Table] |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | $ 1,400 | $ 1,100 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 59,225 | 62,185 |
Derivative, Fair Value, Net |  | (984) | (926) |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement |  | 1,533 | 1,095 |
Derivative Asset, Fair Value, Gross Asset |  | 1,394 | 933 |
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement |  | 2,517 | 2,021 |
Derivative Liability, Fair Value, Gross Liability |  | (2,077) | (1,730) |
Reinsurance Recoverable [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 3,832 | 4,000 |
Derivative, Fair Value, Net |  | 138 | 162 |
Derivative Asset, Fair Value, Gross Asset |  | 138 | 162 |
Derivative Liability, Fair Value, Gross Liability |  | 0 | 0 |
Fixed Maturities [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 388 | 425 |
Derivative, Fair Value, Net |  | 1 | (3) |
Derivative Asset, Fair Value, Gross Asset |  | 1 | 0 |
Derivative Liability, Fair Value, Gross Liability |  | 0 | (3) |
Other Investments [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 8,882 | 23,253 |
Derivative, Fair Value, Net |  | 309 | 1 |
Derivative Asset, Fair Value, Gross Asset |  | 364 | 409 |
Derivative Liability, Fair Value, Gross Liability |  | (55) | (408) |
Other Liabilities [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 32,001 | 19,358 |
Derivative, Fair Value, Net |  | (992) | (798) |
Derivative Asset, Fair Value, Gross Asset |  | 1,030 | 524 |
Derivative Liability, Fair Value, Gross Liability |  | (2,022) | (1,322) |
Other Policyholder Funds and Benefits Payable [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 14,122 | 15,149 |
Derivative, Fair Value, Net |  | (440) | (288) |
Derivative, Fair Value, Net |  | 440 |  |
Derivative Asset, Fair Value, Gross Asset |  | 0 | 0 |
Derivative Liability, Fair Value, Gross Liability |  | (440) | (288) |
Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 55,626 | 58,492 |
Derivative, Fair Value, Net |  | (1,080) | (924) |
Derivative Asset, Fair Value, Gross Asset |  | 1,409 | 1,038 |
Derivative Liability, Fair Value, Gross Liability |  | (2,489) | (1,962) |
Interest Rate Contract [Member] | Other Investments [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Fair Value, Net |  | (115) | 227 |
Interest Rate Contract [Member] | Other Liabilities [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Fair Value, Net |  | 919 |  |
Foreign Exchange Contract [Member] | Other Investments [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Fair Value, Net |  | (27) |  |
Foreign Exchange Contract [Member] | Other Liabilities [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Fair Value, Net |  | 281 |  |
Derivative Financial Instruments, Assets [Member] | Other Investments [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Fair Value, Net | [1] | (309) | (1) | [2]
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Fair Value, Net | [3] | 992 | 798 |
Interest Rate Swap [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 12,400 | 12,900 |
Macro Hedge Program [Member] | Other Liabilities [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Fair Value, Net |  |  | (73) |
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 356 | 653 |
Derivative, Fair Value, Net |  | 26 | 17 |
Derivative Asset, Fair Value, Gross Asset |  | 26 | 17 |
Derivative Liability, Fair Value, Gross Liability |  | 0 | 0 |
Credit Default Swap, Buying Protection [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 227 | 423 |
Derivative, Fair Value, Net |  | (5) | 18 |
Derivative Asset, Fair Value, Gross Asset |  | 1 | 22 |
Derivative Liability, Fair Value, Gross Liability |  | (6) | (4) |
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount | [4] | 1,842 | 2,458 |
Derivative, Fair Value, Net | [4] | 0 | (13) |
Derivative Asset, Fair Value, Gross Asset | [4] | 13 | 9 |
Derivative Liability, Fair Value, Gross Liability | [4] | (13) | (22) |
Credit Derivatives in Offsetting Positions [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 3,905 | 4,059 |
Derivative, Fair Value, Net |  | (2) | (2) |
Derivative Asset, Fair Value, Gross Asset |  | 46 | 40 |
Derivative Liability, Fair Value, Gross Liability |  | (48) | (42) |
Equity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 1,441 | 419 |
Derivative, Fair Value, Net |  | 1 | 15 |
Derivative Asset, Fair Value, Gross Asset |  | 30 | 41 |
Derivative Liability, Fair Value, Gross Liability |  | (29) | (26) |
Put Option [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 500 | 500 |
Derivative, Fair Value, Net |  | 4 | 7 |
Derivative Asset, Fair Value, Gross Asset |  | 4 | 7 |
Derivative Liability, Fair Value, Gross Liability |  | 0 | 0 |
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 928 | 895 |
Derivative, Fair Value, Net |  | 32 | 79 |
Derivative Asset, Fair Value, Gross Asset |  | 32 | 79 |
Derivative Liability, Fair Value, Gross Liability |  | 0 | 0 |
JAPAN | Three Win Related Foreign Currency Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 1,063 | 1,063 |
Derivative, Fair Value, Net |  | (261) | (357) |
Derivative Asset, Fair Value, Gross Asset |  | 0 | 0 |
Derivative Liability, Fair Value, Gross Liability |  | (261) | (357) |
UNITED STATES | GMWB Hedging Instruments [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 10,532 | 10,979 |
Derivative, Fair Value, Net |  | 203 | 158 |
UNITED STATES | GMWB Hedging Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 10,532 | 10,979 |
Derivative, Fair Value, Net |  | 203 | 158 |
Derivative Asset, Fair Value, Gross Asset |  | 360 | 264 |
Derivative Liability, Fair Value, Gross Liability |  | (157) | (106) |
UNITED STATES | Macro Hedge Program [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 4,699 | 4,548 |
Derivative, Fair Value, Net |  | 147 | 147 |
Derivative Asset, Fair Value, Gross Asset |  | 185 | 179 |
Derivative Liability, Fair Value, Gross Liability |  | (38) | (32) |
UNITED STATES | Macro Hedge Program [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 4,699 | 4,548 |
Derivative, Fair Value, Net |  | 147 | 147 |
UNITED STATES | Macro Hedge Program [Member] | Other Investments [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Fair Value, Net |  | (49) | (74) |
UNITED STATES | Macro Hedge Program [Member] | Other Liabilities [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Fair Value, Net |  | (98) |  |
UNITED STATES | Equity Contract [Member] | GMWB Hedging Instruments [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 1,395 | 1,362 |
Derivative, Fair Value, Net |  | 0 | 2 |
UNITED STATES | GMWB Product Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount | [5] | 14,072 | 15,099 |
Derivative, Fair Value, Net | [5] | (412) | (262) |
Derivative Asset, Fair Value, Gross Asset | [5] | 0 | 0 |
Derivative Liability, Fair Value, Gross Liability | [5] | (412) | (262) |
UNITED STATES | GMWB Reinsurance [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Abstract] |  |  |  |
Derivative, Notional Amount |  | 2,905 | 3,106 |
Derivative, Fair Value, Net |  | 106 | 83 |
Derivative Asset, Fair Value, Gross Asset |  | 106 | 83 |
Derivative Liability, Fair Value, Gross Liability |  | $ 0 | $ 0 |
[1] | [1]Included in other investments on the Condensed Consolidated Balance Sheets.
[2] | [2]Includes over-the-counter ("OTC") and OTC-cleared derivative instruments in a net positive fair value position after consideration of the accrued interest and impact of collateral posting requirements which may be imposed by agreements, clearing house rules and applicable law. See the following footnote 5 for derivative liabilities.
[3] | [4]Approximately $3.2 billion and $1.8 billion of investment sales receivable, as of June 30, 2016, and December 31, 2015, respectively, are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value. Included in the total fair value amount are $1.0 billion and $1.2 billion of investments, as of June 30, 2016 and December 31, 2015, for which the fair value is estimated using the net asset value per unit as a practical expedient and which are excluded from the disclosure requirement to classify amounts in the fair value hierarchy in connection with the retrospective adoption of ASU 2015-07, Disclosure for Investments in Certain Entities That Calculate Net Asset Value per Share (or its Equivalent), on January 1, 2016.
[4] | The derivative instruments related to this strategy are held for other investment purposes.
[5] | These derivatives are embedded within liabilities and are not held for risk management purposes.

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