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Derivative and Hedging Activities - Oil, Natural Gas and NGL Revenues (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Feb. 09, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Total revenues and other	$ 260	$ 890	$ 960	$ 2,463	$ 3,992
Not designated as hedging instrument | Oil, natural gas and NGL sales
Derivative [Line Items]
Losses on terminated cash flow hedges	(3)	0	(7)	0	(24)
Total revenues and other	(382)	(910)	(161)	(1,604)	573
Not designated as hedging instrument | Oil, natural gas and NGL sales | Commodity contract
Derivative [Line Items]
Gains (losses) on undesignated oil and natural gas derivatives	$ (379)	$ (910)	$ (154)	$ (1,604)	$ 597

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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The amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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