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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivatives, Fair Value [Line Items]          
Maximum term length, investment cash flow hedges     6 years    
Amounts excluded from assessment of hedge effectiveness $ 0 $ 0 $ 0 $ 0  
Gains (losses) recognized due to hedge ineffectiveness 0 $ 0 0 $ 0  
Cash on deposit representing upfront margin required by clearinghouse $ 18   $ 18    
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 $ 131   $ 131   $ 145
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