OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued operating expenses	$ 99	$ 143
Accrued exploration and development	158	319
Accrued gathering, processing, and transmission - Altus	1	17
Accrued compensation and benefits	116	212
Accrued interest	111	135
Accrued income taxes	18	51
Current asset retirement obligation	47	47
Current operating lease liability	110	169
Current derivative liability	14	0
Other	129	56
Total Other current liabilities	$ 803	$ 1,149