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Accumulated Other Comprehensive Income Loss Level 4 (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Loss, net of tax, beginning of period | $ 494 | $ 900 | $ (337) | $ (329)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 131 | 137 | 566 | 1,405
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (40) | (50) | 356 | (89)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 91 | 87 | 922 | 1,316
Accumulated Other Comprehensive Income, net of tax, end of period | 585 | 987 | 585 | 987
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Gain (Loss) on Investments, Excluding Other than Temporary Impairments | (1) | (3) | 69 | (75)
Income Tax Expense (Benefit) | 22 | 90 | 32 | 102
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 40 | 50 | (356) | 89
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 | 19 | 17 | 61 |
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 |  | 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 | 4 |  | 10 |
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 | 15 |  | 47 |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Loss, net of tax, beginning of period | 1,755 | 2,437 | 1,276 | 1,279
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 119 | 72 | 683 | 1,263
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (34) | (50) | (119) | (83)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 85 | 22 | 564 | 1,180
Accumulated Other Comprehensive Income, net of tax, end of period | 1,840 | 2,459 | 1,840 | 2,459
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Gain (Loss) on Investments, Excluding Other than Temporary Impairments | 52 | 77 | 183 | 128
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 52 | 77 | 183 | 128
Income Tax Expense (Benefit) | 18 | 27 | 64 | 45
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 34 | 50 | 119 | 83
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Loss, net of tax, beginning of period | (3) | (10) | (3) | (7)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (1) | 4 | (1) | (1)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0 | 1 | 0 | 3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (1) | 5 | (1) | 2
Accumulated Other Comprehensive Income, net of tax, end of period | (4) | (5) | (4) | (5)
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Gain (Loss) on Investments, Excluding Other than Temporary Impairments |  | (1) |  | (5)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  | (1) |  | (5)
Income Tax Expense (Benefit) |  | 0 |  | (2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (1) |  | (3)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Loss, net of tax, beginning of period | 57 | 200 | 76 | 130
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (2) | (17) | 7 | 78
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (12) | (11) | (40) | (36)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (14) | (28) | (33) | 42
Accumulated Other Comprehensive Income, net of tax, end of period | 43 | 172 | 43 | 172
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [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] |  |  |  |
Income Tax Expense (Benefit) | 7 | 6 | 21 | 20
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 12 | 11 | 40 | 36
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | 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] |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 19 | 17 | 61 | 56
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | 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 | 0 | 4 | 7
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | 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 | 4 | 1 | 10 | 3
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | 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 | 15 | 16 | 47 | 46
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Loss, net of tax, beginning of period | 13 | (68) | 6 | (55)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 14 | 78 | 21 | 65
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 14 | 78 | 21 | 65
Accumulated Other Comprehensive Income, net of tax, end of period | 27 | 10 | 27 | 10
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Loss, net of tax, beginning of period | (1,328) | (1,659) | (1,692) | (1,676)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 1 | 0 | (144) | 0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 6 | 10 | 515 | 27
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 7 | 10 | 371 | 27
Accumulated Other Comprehensive Income, net of tax, end of period | (1,321) | (1,649) | (1,321) | (1,649)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements | 144 |  |  |
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Other Pension Plan, Postretirement or Supplemental Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amortization of prior service credit | 2 | 2 | 0 | 5
Amortization of actuarial loss | (12) | (17) | (45) | (46)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements | 0 |  | 747 |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | (10) | (15) | (792) | (41)
Income Tax Expense (Benefit) | (4) | (5) | (277) | (14)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ (6) | $ (10) | $ (515) | $ (27)

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