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Derivative and Hedging Activities - Oil, Natural Gas and NGL Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Gains on undesignated oil, natural gas and NGL derivatives									$ 596	$ 5	$ (34)
Total oil, natural gas and NGL revenues	$ 1,259	$ 975	$ 521	$ 2,541	$ 1,926	$ 2,087	$ 2,386	$ 2,196	5,296	8,595	10,030
Oil, natural gas and NGL sales
Derivative [Line Items]
Losses on terminated cash flow hedges									(33)	(35)	(34)
Oil, Natural Gas and NGL
Derivative [Line Items]
Oil, natural gas and NGL revenues									2,745	4,517	5,189
Total oil, natural gas and NGL revenues									3,341	4,522	5,155
Not designated as hedging instrument | Oil, natural gas and NGL sales | Commodity contracts
Derivative [Line Items]
Gains on undesignated oil, natural gas and NGL derivatives									$ 629	$ 40	$ 0

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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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Total revenues from oil and gas producing activities.

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