OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued operating expenses	$ 91	$ 143
Accrued exploration and development	167	319
Accrued gathering, processing, and transmission - Altus	0	17
Accrued compensation and benefits	170	212
Accrued interest	140	135
Accrued income taxes	25	51
Current asset retirement obligation	56	47
Current operating lease liability	116	169
Other	97	56
Total Other current liabilities	$ 862	$ 1,149