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DEBT - Revolving Credit Facility (Details) - USD ($)
2 Months Ended
Oct. 31, 2020
Oct. 27, 2020
Dec. 31, 2020
Sep. 30, 2014
Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity       $ 900,000,000
Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 540,000,000    
Line of credit facility, expected reduction of commitments   492,000,000    
Line of current borrowing capacity   1,200,000,000 $ 307,000,000  
Proceeds from long-term lines of credit   $ 225,000,000    
Margin increase, percentage   0.25%    
Margin increase, additional increase each subsequent fiscal quarter   0.25%    
Line of credit facility, unused capacity, commitment fee percentage   0.50%    
Revolving Credit Facility | Line of Credit | First 24 Months        
Debt Instrument [Line Items]        
Derivative, hedging percent   50.00%    
Revolving Credit Facility | Line of Credit | First 24 Months | Crude Oil Hedge Positions        
Debt Instrument [Line Items]        
Derivative, allocation percent   75.00%    
Derivative, period   24 months    
Revolving Credit Facility | Line of Credit | Month 25 Through Month 36 | Crude Oil Hedge Positions        
Debt Instrument [Line Items]        
Derivative, allocation percent   50.00%    
Revolving Credit Facility | Line of Credit | 48 Month Period        
Debt Instrument [Line Items]        
Derivative, period   48 months    
Derivative, hedging percent   80.00%    
Revolving Credit Facility | Line of Credit | LIBOR        
Debt Instrument [Line Items]        
Interest rate floor   1.00%    
Interest rate added to variable rate basis   1.00%    
Revolving Credit Facility | Line of Credit | LIBOR | Minimum        
Debt Instrument [Line Items]        
Interest rate added to variable rate basis     3.00%  
Revolving Credit Facility | Line of Credit | LIBOR | Maximum        
Debt Instrument [Line Items]        
Interest rate added to variable rate basis     4.00%  
Revolving Credit Facility | Line of Credit | Alternative Base Rate        
Debt Instrument [Line Items]        
Interest rate floor   2.00%    
Revolving Credit Facility | Line of Credit | Alternative Base Rate | Minimum        
Debt Instrument [Line Items]        
Interest rate added to variable rate basis     2.00%  
Revolving Credit Facility | Line of Credit | Alternative Base Rate | Maximum        
Debt Instrument [Line Items]        
Interest rate added to variable rate basis     3.00%  
Revolving Credit Facility | Line of Credit | Federal Funds Rate        
Debt Instrument [Line Items]        
Interest rate added to variable rate basis   0.50%    
Revolving Credit Facility | Line of Credit | LIBOR Applicable Margin | Minimum        
Debt Instrument [Line Items]        
Interest rate added to variable rate basis   3.00%    
Revolving Credit Facility | Line of Credit | LIBOR Applicable Margin | Maximum        
Debt Instrument [Line Items]        
Interest rate added to variable rate basis   4.00%    
Revolving Credit Facility | Line of Credit | ABR Applicable Margin | Minimum        
Debt Instrument [Line Items]        
Interest rate added to variable rate basis   2.00%    
Revolving Credit Facility | Line of Credit | ABR Applicable Margin | Maximum        
Debt Instrument [Line Items]        
Interest rate added to variable rate basis   3.00%    
Revolving Credit Facility | Letters of Credit        
Debt Instrument [Line Items]        
Proceeds from long-term lines of credit $ 118,000,000 $ 118,000,000    
Letters of Credit | Line of Credit        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 200,000,000    
Letters of credit outstanding amount     $ 134,000,000