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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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 15   15    
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 82   82   131
Gain (Loss) Recognized in Other Comprehensive Income  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Long Term Investments Location [Member]          
Derivatives, Fair Value [Line Items]          
Fair Value    
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Accounts Payable Accrued Expenses And Other Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Fair Value    
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Notional Amount 750   750   750
Income Statement impact of fair value hedges  
Balance Sheet impact of fair value hedge assets    
Balance Sheet impact of fair value hedge liabilities      
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Notional Amount 23   23    
Income Statement impact of fair value hedges  
Balance Sheet impact of fair value hedge assets