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DEBT - 2014 Revolving Credit Facility (Details) - USD ($)
 3 Months Ended
May 18, 2020
Mar. 31, 2020
May 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Debt          
Line of credit facility, maximum borrowing capacity   $ 1,000,000,000      
Available liquidity   395,000,000      
Unrestricted cash   67,000,000      
2014 Revolving Credit Facility          
Debt          
Available borrowing capacity before a month-end minimum liquidity requirement   328,000,000      
Financial covenant minimum month end liquidity   150,000,000      
Borrowing base   2,300,000,000      
Letters of Credit | 2014 Revolving Credit Facility          
Debt          
Maximum sub-limit on borrowing capacity for issuance of letters of credit   400,000,000     $ 400,000,000
Aggregate letters of credit issued   $ 165,000,000     $ 165,000,000
Subsequent Event          
Debt          
Line of credit facility, maximum borrowing capacity       $ 900,000,000  
Available liquidity     $ 165,000,000    
Unrestricted cash     148,000,000    
Subsequent Event | 2014 Revolving Credit Facility          
Debt          
Available borrowing capacity before a month-end minimum liquidity requirement     17,000,000    
Borrowing base $ 1,200,000,000        
Subsequent Event | Letters of Credit | 2014 Revolving Credit Facility          
Debt          
Aggregate letters of credit issued     $ 152,000,000 $ 152,000,000