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Investments and Derivative Instruments Level 4 Cash Flow Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     $ 20  
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net     0 $ 0
Cash Flow Hedging [Member]        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 12 $ 3 9 27
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivatives in Cash Flow Hedging Relationships [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (16) 18 (3) 27
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0 0 (1)
Interest Rate Swap [Member] | Cash Flow Hedging [Member]        
Derivatives in Cash Flow Hedging Relationships [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net     (2) 30
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net       (1)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivatives in Cash Flow Hedging Relationships [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (22) 20    
Currency Swap [Member] | Cash Flow Hedging [Member]        
Derivatives in Cash Flow Hedging Relationships [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net     (1) (3)
Currency Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivatives in Cash Flow Hedging Relationships [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 6 (2)    
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0   (1)  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Currency Swap [Member] | Cash Flow Hedging [Member]        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 3   (7)  
Interest Income [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 9   17  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 0   1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Currency Swap [Member] | Cash Flow Hedging [Member]        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 3 0 (7) 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Income [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 9 $ 3 $ 17 $ 26