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Derivatives - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
derivative_instrument
Derivative [Line Items]          
Hedging ineffectiveness recorded in earnings $ 0 $ 0 $ 0 $ 0  
Estimated loss reclassified from other comprehensive income (loss) to earnings as contracts settle     3,000,000    
Designated [Member]          
Derivative [Line Items]          
Derivative liability notional amount         $ 750,000,000
Derivative notional amount $ 750,000,000   $ 750,000,000    
Designated [Member] | Interest Rate Swap [Member]          
Derivative [Line Items]          
Number of interest rate swaps | derivative_instrument         8
Not designated [Member] | Interest rate contracts [Member]          
Derivative [Line Items]          
Reclassification from OCI to interest expense related to the derivatives net of tax   $ 2,000,000   $ 5,000,000