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LEASES - Supplement balance sheet information (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2020
USD ($)
drilling_rig
Dec. 31, 2019
USD ($)
Leases [Abstract]    
Operating lease, net $ 46 $ 59
Finance lease, net 0 2
Total right-of-use assets 46 61
Operating lease 18 27
Finance lease 1 1
Operating lease 35 37
Finance lease 1 1
Total lease liabilities $ 55 $ 66
Number of drilling rigs released | drilling_rig 5  
Operating Lease, Right-of-Use Asset, Number Of Drilling Rigs | drilling_rig 2