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REVENUE RECOGNITION - Disaggregation of revenue (Details) - USD ($) $ in Millions	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2020	Oct. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of revenue
Oil and natural gas sales	$ 237	$ 1,092	$ 2,270	$ 2,590
Revenue not from contract with customer	56	224	423	473
Net derivative (loss) gain from commodity contracts	(141)	91	(59)	1
Total revenues	152	1,407	2,634	3,064
Oil
Disaggregation of revenue
Oil and natural gas sales	176	874	1,884	2,110
NGLs
Disaggregation of revenue
Oil and natural gas sales	29	106	179	260
Natural gas
Disaggregation of revenue
Oil and natural gas sales	32	112	207	220
Electricity sales
Disaggregation of revenue
Revenue not from contract with customer	15	86	112	111
Trading revenue
Disaggregation of revenue
Revenue not from contract with customer	38	124	286	330
Other revenue
Disaggregation of revenue
Revenue not from contract with customer	$ 3	$ 14	$ 25	$ 32

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