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Accumulated Other Comprehensive Income Loss Level 4 (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 254 $ 1,150 $ (329) $ 928
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 617 259    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (34) (37)    
Other Comprehensive Income (Loss), Net of Tax 583 222    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Gain (Loss) on Investments, Excluding Other than Temporary Impairments (132) 17    
Income Tax Expense (Benefit) 58 158    
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 34      
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   37    
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 5      
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      
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      
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,801 2,578 1,279 2,370
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 549 232    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (27) (24)    
Other Comprehensive Income (Loss), Net of Tax 522 208    
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 27 24    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Gain (Loss) on Investments, Excluding Other than Temporary Impairments 41 37    
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 41 37    
Income Tax Expense (Benefit) 14 13    
Accumulated Other-than-Temporary Impairment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (15) (8) (7) (5)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (9) (4)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1 1    
Other Comprehensive Income (Loss), Net of Tax (8) (3)    
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)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Gain (Loss) on Investments, Excluding Other than Temporary Impairments (1) (1)    
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest (1) (1)    
Income Tax Expense (Benefit) 0 0    
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 184 177 130 150
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 70 32    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (16) (5)    
Other Comprehensive Income (Loss), Net of Tax 54 27    
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 16 5    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 24 7    
Income Tax Expense (Benefit) 8 2    
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (49) (28) (55) (8)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 6 (20)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0    
Other Comprehensive Income (Loss), Net of Tax 6 (20)    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (1,667) (1,569) $ (1,676) $ (1,579)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1 19    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 8 (9)    
Other Comprehensive Income (Loss), Net of Tax 9 10    
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 (8) 9    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 2 (2)    
Defined Benefit Plan, Actuarial Gain (Loss) (15) 16    
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest (13) 14    
Income Tax Expense (Benefit) (5) 5    
Designated as Hedging Instrument [Member] | Cash Flow Hedging [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 24 7    
Designated as Hedging Instrument [Member] | Gain (Loss) on Investments [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [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 5      
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   1    
Designated as Hedging Instrument [Member] | Gain (Loss) on Investments [Member] | Currency Swap [Member] | Cash Flow Hedging [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   (10)    
Designated as Hedging Instrument [Member] | Investment Income [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [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      
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