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Accumulated Other Comprehensive Income Loss Level 4 (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 987 | $ 140 | $ 987 | $ 140 | $ 900 | $ (329) | $ 188 | $ 928
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 137 | (68) | 1,405 | (779) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (50) | 20 | (89) | (9) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 87 | (48) | 1,316 | (788) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Gain (Loss) on Investments, Excluding Other than Temporary Impairments | (3) | (4) | (75) | 33 |  |  |  |
Income Tax Expense (Benefit) | 90 | 7 | 102 | 222 |  |  |  |
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 | 50 |  | 89 |  |  |  |  |
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 |  | (20) |  | 9 |  |  |  |
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 | 0 |  | 7 |  |  |  |  |
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 |  | 3 |  |  |  |  |
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 |  | 46 |  |  |  |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 2,459 | 1,563 | 2,459 | 1,563 | 2,437 | 1,279 | 1,657 | 2,370
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 72 | (113) | 1,263 | (798) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (50) | 19 | (83) | (9) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 22 | (94) | 1,180 | (807) |  |  |  |
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 | 50 | (19) | 83 | 9 |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Gain (Loss) on Investments, Excluding Other than Temporary Impairments | 77 | (29) | 128 | 14 |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | 77 | (29) | 128 | 14 |  |  |  |
Income Tax Expense (Benefit) | 27 | (10) | 45 | 5 |  |  |  |
Accumulated Other-than-Temporary Impairment [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (5) | (4) | (5) | (4) | (10) | (7) | (7) | (5)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 4 | 2 | (1) | 0 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1 | 1 | 3 | 1 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 5 | 3 | 2 | 1 |  |  |  |
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) | (1) | (3) | (1) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Gain (Loss) on Investments, Excluding Other than Temporary Impairments | (1) | (1) | (5) | (2) |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | (1) | (1) | (5) | (2) |  |  |  |
Income Tax Expense (Benefit) | 0 | 0 | (2) | (1) |  |  |  |
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 172 | 170 | 172 | 170 | 200 | 130 | 122 | 150
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (17) | 58 | 78 | 49 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (11) | (10) | (36) | (29) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (28) | 48 | 42 | 20 |  |  |  |
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 | 11 | 10 | 36 | 29 |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | 17 | 16 | 56 | 44 |  |  |  |
Income Tax Expense (Benefit) | 6 | 6 | 20 | 15 |  |  |  |
Accumulated Translation Adjustment [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 10 | (38) | 10 | (38) | (68) | (55) | (24) | (8)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 78 | (14) | 65 | (30) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | 0 | 0 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 78 | (14) | 65 | (30) |  |  |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (1,649) | (1,551) | (1,649) | (1,551) | $ (1,659) | $ (1,676) | $ (1,560) | $ (1,579)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0 | (1) | 0 | 0 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 10 | 10 | 27 | 28 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 10 | 9 | 27 | 28 |  |  |  |
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) | (10) | (27) | (28) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 2 | 2 | 5 | 5 |  |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) | (17) | (17) | (46) | (48) |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | (15) | (15) | (41) | (43) |  |  |  |
Income Tax Expense (Benefit) | (5) | (5) | (14) | (15) |  |  |  |
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 | 17 | 16 | 56 | 44 |  |  |  |
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 | 0 | 1 | 7 | 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 | 0 | 3 | (7) |  |  |  |
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 | $ 15 | $ 46 | $ 47 |  |  |  |

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Data Type: | na
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