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Debt and Credit Agreements - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Apr. 19, 2016
Apr. 18, 2016
Debt Instrument [Line Items]        
Change in interest rate during period 0.00%      
Revolving credit facility        
Debt Instrument [Line Items]        
Line of credit $ 0      
Remaining borrowing capacity $ 1,800,000,000      
Interest rate 2.30% 2.60%    
Subsequent Event | Revolving credit facility        
Debt Instrument [Line Items]        
Remaining borrowing capacity     $ 1,600,000,000  
Borrowing base     3,200,000,000.0 $ 3,400,000,000.0
Current borrowing capacity     $ 1,800,000,000