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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Derivatives, Fair Value [Line Items]          
Maximum term length, investment cash flow hedges     7 years    
Amounts excluded from assessment of hedge effectiveness  
Gains (losses) recognized due to hedge ineffectiveness  
Cash on deposit representing upfront margin required by clearinghouse 14   14    
Net liability position of derivatives that contain certain credit risk-related contingent features    
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Derivatives, Fair Value [Line Items]          
Notional Amount 65   65   131
Fair Value    
Gain (Loss) Recognized in Other Comprehensive Income  
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Notional Amount 750   750   750
Fair Value    
Gain (Loss) Recognized in Income Statement  
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Notional Amount 23   23    
Fair Value    
Gain (Loss) Recognized in Income Statement      
Non designated [Member] | Forward Contracts [Member]          
Derivatives, Fair Value [Line Items]          
Notional Amount 50   50    
Fair Value      
Gain (Loss) Recognized in Income Statement