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Debt and Credit Agreements - Narrative (Details) - USD ($)
Apr. 22, 2019
Mar. 31, 2019
Dec. 31, 2018
Revolving credit facility      
Debt Instrument [Line Items]      
Remaining borrowing capacity   $ 1,800,000,000  
Line of credit   $ 0  
6.51% weighted-average senior notes      
Debt Instrument [Line Items]      
Weighted average interest rate   6.51% 6.51%
Subsequent Event | Revolving credit facility      
Debt Instrument [Line Items]      
Borrowing base $ 3,200,000,000    
Remaining borrowing capacity $ 1,500,000,000    
Minimum | Subsequent Event | ABR Loans | Revolving credit facility      
Debt Instrument [Line Items]      
Basis spread 50.00%    
Minimum | Subsequent Event | LIBOR Loans | Revolving credit facility      
Debt Instrument [Line Items]      
Basis spread 112.50%    
Maximum | Subsequent Event | ABR Loans | Revolving credit facility      
Debt Instrument [Line Items]      
Basis spread 125.00%    
Maximum | Subsequent Event | LIBOR Loans | Revolving credit facility      
Debt Instrument [Line Items]      
Basis spread 175.00%    
Non Investment Grade | Minimum | Subsequent Event | Revolving credit facility      
Debt Instrument [Line Items]      
Commitment fee percent 30.00%    
Non Investment Grade | Minimum | Subsequent Event | ABR Loans | Revolving credit facility      
Debt Instrument [Line Items]      
Basis spread 150.00%    
Non Investment Grade | Maximum | Subsequent Event | Revolving credit facility      
Debt Instrument [Line Items]      
Commitment fee percent 42.50%    
Non Investment Grade | Maximum | Subsequent Event | ABR Loans | Revolving credit facility      
Debt Instrument [Line Items]      
Basis spread 225.00%    
Investment Grade | Minimum | Subsequent Event | Revolving credit facility      
Debt Instrument [Line Items]      
Commitment fee percent 12.50%    
Investment Grade | Minimum | Subsequent Event | ABR Loans | Revolving credit facility      
Debt Instrument [Line Items]      
Basis spread 12.50%    
Investment Grade | Maximum | Subsequent Event | Revolving credit facility      
Debt Instrument [Line Items]      
Commitment fee percent 27.50%    
Investment Grade | Maximum | Subsequent Event | ABR Loans | Revolving credit facility      
Debt Instrument [Line Items]      
Basis spread 75.00%