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Credit Facilities and Long-Term Debt (Details Textual)
€ in Millions
9 Months Ended
Sep. 20, 2011
USD ($)
Sep. 30, 2015
USD ($)
Mar. 27, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 04, 2013
EUR (€)
Letter of Credit          
Credit Facilities and Long-Term Debt [Abstract]          
Debt instrument aggregate principal amount     $ 100,000,000    
Revolving Credit Facility          
Credit Facilities and Long-Term Debt [Abstract]          
Debt instrument aggregate principal amount     600,000,000    
Permitted increases in Credit Facility borrowing base     200,000,000    
Maximum permitted increases in Credit Facility borrowing base     $ 800,000,000    
Interest rate per annum, effective rate   1.00%      
Maximum leverage ratio   3.50      
Risk Sharing Finance Facility Agreement          
Credit Facilities and Long-Term Debt [Abstract]          
Debt instrument aggregate principal amount   $ 134,000,000     € 120
Maximum leverage ratio   3.50      
Line of Credit Facility, Amount Outstanding   $ 77,000,000   $ 84,000,000  
Senior Notes          
Credit Facilities and Long-Term Debt [Abstract]          
Redemption price percentage 101.00%        
Senior Notes Due 2016, 3.550%          
Credit Facilities and Long-Term Debt [Abstract]          
Fair value of senior notes due   613,000,000   621,000,000  
Interest on notes due 3.55%        
Long-term Debt, Gross $ 600,000,000 600,000,000 [1]   600,000,000 [1]  
Senior Notes Due 2021, 4.875%          
Credit Facilities and Long-Term Debt [Abstract]          
Fair value of senior notes due   655,000,000   653,000,000  
Interest on notes due 4.875%        
Long-term Debt, Gross $ 600,000,000 $ 600,000,000 [1]   $ 600,000,000 [1]  
[1] The fair value of our Senior Notes (as defined below) was determined using quoted prices in active markets for identical securities, which are considered Level 1 inputs. The fair value of our Senior Notes due 2016 was $613 million and $621 million as of September 30, 2015 and December 31, 2014, respectively. The fair value of our Senior Notes due 2021 was $655 million and $653 million as of September 30, 2015 and December 31, 2014, respectively.