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Accumulated Other Comprehensive Income, Net of Tax Level 4 (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (337)       $ (329)       $ (337) $ (329) $ 928
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Balance at the end of period, Accumulated Other Comprehensive Income (Loss) (337)       (329)       (337) (329) 928
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax                 (13) (1,279) 1,142
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 (5) (22) 135
Other Comprehensive Income (Loss), Net of Tax                 (8) (1,257) 1,007
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)       $ (329)       $ 928 (329) 928 (79)
Gain (Loss) on Investments, Excluding Other than Temporary Impairments                 (212) (54) 75
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Income Tax Expense (Benefit)                 (92) 305 350
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 0 $ 0 $ 0 0 0 $ 9 $ 0 0 0 9 (551)
Accumulated Net Unrealized Investment Gain (Loss) [Member]                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,276       1,279       1,276 1,279 2,370
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)         1,279         1,279 2,370
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax                 83 (1,112) 1,474
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 86 (21) 91
Other Comprehensive Income (Loss), Net of Tax                 (3) (1,091) 1,383
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)       1,279       2,370 1,279 2,370 987
Accumulated Other-than-Temporary Impairment [Member]                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (3)       (7)       (3) (7) (5)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)         (7)         (7) (5)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax                 1 (3) 3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 (3) (1) (4)
Other Comprehensive Income (Loss), Net of Tax                 4 (2) 7
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)       (7)       (5) (7) (5) (12)
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 76       130       76 130 150
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)         130         130 150
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax                 (8) 18 89
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 46 38 47
Other Comprehensive Income (Loss), Net of Tax                 (54) (20) 42
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)       130       150 130 150 108
Accumulated Translation Adjustment [Member]                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 6       (55)       6 (55) (8)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)         (55)         (55) (8)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax                 (37) (47) 13
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 (98) 0 112
Other Comprehensive Income (Loss), Net of Tax                 61 (47) (99)
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)       (55)       (8) (55) (8) 91
AOCI Attributable to Parent [Member]                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Balance at the end of period, Accumulated Other Comprehensive Income (Loss) (337)       (329)       (337) (329) 928
Other Comprehensive Income (Loss), Net of Tax                 (8) (1,257) 1,007
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)       (329)       928 (329) 928 (79)
Accumulated Defined Benefit Plans Adjustment [Member]                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (1,692)       (1,676)       (1,692) (1,676) (1,579)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)         $ (1,676)         (1,676) (1,579)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax                 (52) (135) (437)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 (36) (38) (111)
Other Comprehensive Income (Loss), Net of Tax                 (16) (97) (326)
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)       $ (1,676)       $ (1,579) (1,676) (1,579) (1,253)
Cash Flow Hedging [Member]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net                 71 59 73
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                 5    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                   22 (135)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 (86) 21 91
Gain (Loss) on Investments, Excluding Other than Temporary Impairments                 132 (32) 217
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                 132 (32) 217
Income Tax Expense (Benefit)                 46 (11) 76
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest                 0 0 (50)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax                 (118) 0 172
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment [Member]                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 3 1 (4)
Gain (Loss) on Investments, Excluding Other than Temporary Impairments                 (5) (2) (6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                 (5) (2) (6)
Income Tax Expense (Benefit)                 (2) (1) (2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Translation Adjustment [Member]                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 (98) 0 112
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                 (118) 0 172
Income Tax Expense (Benefit)                 (20) 0 60
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 36 38 111
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                 (55) (58) (171)
Income Tax Expense (Benefit)                 (19) (20) (60)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)                 6 7 7
Defined Benefit Plan, Actuarial Gain (Loss)                 (61) (65) (50)
Defined Benefit Plan, Settlements, Plan Assets                 0 0 (128)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedging [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]                      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 (46) (38) (47)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                 71 59 73
Income Tax Expense (Benefit)                 25 21 26
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Swap [Member] | Gain (Loss) on Investments [Member] | Cash Flow Hedging [Member]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net                 11   (1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Swap [Member] | Investment Income [Member] | Cash Flow Hedging [Member]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net                 62   87
Reclassification out of Accumulated Other Comprehensive Income [Member] | Currency Swap [Member] | Gain (Loss) on Investments [Member] | Cash Flow Hedging [Member]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net                 (2)   $ (13)
Designated as Hedging Instrument [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Swap [Member] | Gain (Loss) on Investments [Member] | Cash Flow Hedging [Member]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net                 11 4  
Designated as Hedging Instrument [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Swap [Member] | Investment Income [Member] | Cash Flow Hedging [Member]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net                 62 64  
Designated as Hedging Instrument [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Currency Swap [Member] | Gain (Loss) on Investments [Member] | Cash Flow Hedging [Member]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]                      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net                 $ (2) $ (9)