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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)