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DERIVATIVES - Commodity Price Risk (Details) $ in Millions	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) bbl / d $ / barrel	Oct. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Derivatives
Non-cash derivative (loss) gain | $	$ (140)	$ (17)	$ (170)	$ 229
Net (payments) proceeds on settled commodity derivatives | $	(1)	108	111	(228)
Net derivative (loss) gain from commodity contracts | $	$ (141)	$ 91	$ (59)	$ 1
Calls | Q1 2021
Derivatives
Daily volume (in Bbl) | bbl / d	19,028
Weighted-average price (in dollars per barrel) | $ / barrel	47.88
Calls | Q2 2021
Derivatives
Daily volume (in Bbl) | bbl / d	33,372
Weighted-average price (in dollars per barrel) | $ / barrel	48.64
Calls | Q3 2021
Derivatives
Daily volume (in Bbl) | bbl / d	35,202
Weighted-average price (in dollars per barrel) | $ / barrel	49.83
Calls | Q4 2021
Derivatives
Daily volume (in Bbl) | bbl / d	10,645
Weighted-average price (in dollars per barrel) | $ / barrel	56.00
Calls | 2022
Derivatives
Daily volume (in Bbl) | bbl / d	30,783
Weighted-average price (in dollars per barrel) | $ / barrel	59.37
Calls | January - October 2023
Derivatives
Daily volume (in Bbl) | bbl / d	17,758
Weighted-average price (in dollars per barrel) | $ / barrel	58.01
Puts | Purchased | Q1 2021
Derivatives
Daily volume (in Bbl) | bbl / d	39,148
Weighted-average price (in dollars per barrel) | $ / barrel	41.88
Puts | Purchased | Q2 2021
Derivatives
Daily volume (in Bbl) | bbl / d	37,872
Weighted-average price (in dollars per barrel) | $ / barrel	40.00
Puts | Purchased | Q3 2021
Derivatives
Daily volume (in Bbl) | bbl / d	36,617
Weighted-average price (in dollars per barrel) | $ / barrel	40.00
Puts | Purchased | Q4 2021
Derivatives
Daily volume (in Bbl) | bbl / d	35,483
Weighted-average price (in dollars per barrel) | $ / barrel	40.00
Puts | Purchased | 2022
Derivatives
Daily volume (in Bbl) | bbl / d	30,783
Weighted-average price (in dollars per barrel) | $ / barrel	40.00
Puts | Purchased | January - October 2023
Derivatives
Daily volume (in Bbl) | bbl / d	17,758
Weighted-average price (in dollars per barrel) | $ / barrel	40.00
Puts | Sold | Q1 2021
Derivatives
Daily volume (in Bbl) | bbl / d	15,659
Weighted-average price (in dollars per barrel) | $ / barrel	35.97
Puts | Sold | Q2 2021
Derivatives
Daily volume (in Bbl) | bbl / d	15,149
Weighted-average price (in dollars per barrel) | $ / barrel	31.41
Puts | Sold | Q3 2021
Derivatives
Daily volume (in Bbl) | bbl / d	14,647
Weighted-average price (in dollars per barrel) | $ / barrel	30.00
Puts | Sold | Q4 2021
Derivatives
Daily volume (in Bbl) | bbl / d	14,193
Weighted-average price (in dollars per barrel) | $ / barrel	32.00
Puts | Sold | 2022
Derivatives
Daily volume (in Bbl) | bbl / d	3,042
Weighted-average price (in dollars per barrel) | $ / barrel	32.00
Puts | Sold | January - October 2023
Derivatives
Daily volume (in Bbl) | bbl / d	0
Weighted-average price (in dollars per barrel) | $ / barrel	0
Swaps | Q1 2021
Derivatives
Daily volume (in Bbl) | bbl / d	7,830
Weighted-average price (in dollars per barrel) | $ / barrel	43.74
Swaps | Q2 2021
Derivatives
Daily volume (in Bbl) | bbl / d	7,574
Weighted-average price (in dollars per barrel) | $ / barrel	44.13
Swaps | Q3 2021
Derivatives
Daily volume (in Bbl) | bbl / d	7,323
Weighted-average price (in dollars per barrel) | $ / barrel	43.82
Swaps | Q4 2021
Derivatives
Daily volume (in Bbl) | bbl / d	7,097
Weighted-average price (in dollars per barrel) | $ / barrel	45.30
Swaps | 2022
Derivatives
Daily volume (in Bbl) | bbl / d	6,576
Weighted-average price (in dollars per barrel) | $ / barrel	46.29
Swaps | January - October 2023
Derivatives
Daily volume (in Bbl) | bbl / d	5,919
Weighted-average price (in dollars per barrel) | $ / barrel	47.57

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