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DEBT - 2014 Revolving Credit Facility (Details) - 2014 Revolving Credit Facility - USD ($)
$ in Millions
1 Months Ended
Oct. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Debt      
Available borrowing capacity, subject to minimum liquidity requirement   $ 490  
Minimum month end liquidity   150  
Borrowing base $ 2,300    
Letters of Credit      
Debt      
Maximum sub-limit on borrowing capacity for issuance of letters of credit   400 $ 400
Aggregate letters of credit issued   $ 167 $ 148