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Accumulated Other Comprehensive Income Loss Level 4 (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (207) | $ 254 | $ (337) | $ (329)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 157 | 617 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (27) | (34) |  |
Other Comprehensive Income (Loss), Net of Tax | 130 | 583 |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Gain (Loss) on Investments, Excluding Other than Temporary Impairments | (19) | (132) |  |
Income Tax Expense (Benefit) | 109 | 58 |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 27 | 34 |  |
Gain (Loss) on Investments [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 4 |  |  |
Gain (Loss) on Investments [Member] | Currency Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 1 |  |  |
Investment Income [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 16 |  |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 1,413 | 1,801 | 1,276 | 1,279
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 160 | 549 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (23) | (27) |  |
Other Comprehensive Income (Loss), Net of Tax | 137 | 522 |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 23 | 27 |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Gain (Loss) on Investments, Excluding Other than Temporary Impairments | 36 | 41 |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 36 | 41 |  |
Income Tax Expense (Benefit) | 13 | 14 |  |
Accumulated Other-than-Temporary Impairment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (4) | (15) | (3) | (7)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (1) | (9) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 1 |  |
Other Comprehensive Income (Loss), Net of Tax | (1) | (8) |  |
Accumulated Other-than-Temporary Impairment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (1) |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Gain (Loss) on Investments, Excluding Other than Temporary Impairments |  | (1) |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  | (1) |  |
Income Tax Expense (Benefit) |  | 0 |  |
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 58 | 184 | 76 | 130
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (4) | 70 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (14) | (16) |  |
Other Comprehensive Income (Loss), Net of Tax | (18) | 54 |  |
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 14 | 16 |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 21 | 24 |  |
Income Tax Expense (Benefit) | 7 | 8 |  |
Accumulated Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 8 | (49) | 6 | (55)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 2 | 6 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 |  |
Other Comprehensive Income (Loss), Net of Tax | 2 | 6 |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (1,682) | (1,667) | $ (1,692) | $ (1,676)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0 | 1 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 10 | 8 |  |
Other Comprehensive Income (Loss), Net of Tax | 10 | 9 |  |
Accumulated Defined Benefit Plans Adjustment [Member] | Other Postretirement Benefit Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (10) | (8) |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 1 | 2 |  |
Defined Benefit Plan, Actuarial Gain (Loss) | (16) | (15) |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | (15) | (13) |  |
Income Tax Expense (Benefit) | (5) | (5) |  |
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 21 | $ 24 |  |
Designated as Hedging Instrument [Member] | Gain (Loss) on Investments [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 4 |  |  |
Designated as Hedging Instrument [Member] | Gain (Loss) on Investments [Member] | Currency Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 1 |  |  |
Designated as Hedging Instrument [Member] | Investment Income [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 16 |  |  |

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