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Debt and Credit Agreements (Details 3) - Revolving credit facility - USD ($)
Apr. 17, 2015
Jun. 30, 2015
Apr. 16, 2015
Debt Instrument [Line Items]      
Borrowing base $ 3,400,000,000.0   $ 3,100,000,000.0
Current borrowing capacity 1,800,000,000   $ 1,400,000,000
Availability under the credit facility   $ 1,400,000,000  
Accordion Feature, Amended Facility      
Debt Instrument [Line Items]      
Borrowing base $ 500,000,000    
Minimum      
Debt Instrument [Line Items]      
Commitment fee on the unused available balance 0.30%    
Maximum      
Debt Instrument [Line Items]      
Commitment fee on the unused available balance 0.50%    
Eurodollar LIBOR      
Debt Instrument [Line Items]      
Description of variable rate basis Eurodollar (LIBOR)    
Alternate base rate (ABR)      
Debt Instrument [Line Items]      
Description of variable rate basis alternate base rate (ABR)    
Debt Instrument Leverage Ratio Less than 1.0x | Eurodollar LIBOR      
Interest Rates Under Amended Credit Facility      
Basis spread on variable rate 1.50%    
Debt Instrument Leverage Ratio Less than 1.0x | Alternate base rate (ABR)      
Interest Rates Under Amended Credit Facility      
Basis spread on variable rate 0.50%    
Debt Instrument Leverage Ratio Greater than or Equal to 1.0x but Less than 2.0x | Eurodollar LIBOR      
Interest Rates Under Amended Credit Facility      
Basis spread on variable rate 1.75%    
Debt Instrument Leverage Ratio Greater than or Equal to 1.0x but Less than 2.0x | Alternate base rate (ABR)      
Interest Rates Under Amended Credit Facility      
Basis spread on variable rate 0.75%    
Debt Instrument Leverage Ratio Greater than or Equal to 2.0x but Less 3.0x | Eurodollar LIBOR      
Interest Rates Under Amended Credit Facility      
Basis spread on variable rate 2.00%    
Debt Instrument Leverage Ratio Greater than or Equal to 2.0x but Less 3.0x | Alternate base rate (ABR)      
Interest Rates Under Amended Credit Facility      
Basis spread on variable rate 1.00%    
Debt Instrument Leverage Ratio Greater than or Equal to 3.0x | Eurodollar LIBOR      
Interest Rates Under Amended Credit Facility      
Basis spread on variable rate 2.25%    
Debt Instrument Leverage Ratio Greater than or Equal to 3.0x | Alternate base rate (ABR)      
Interest Rates Under Amended Credit Facility      
Basis spread on variable rate 1.25%