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Derivative and Hedging Activities - Oil, Natural Gas and NGL Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Gains (losses) on undesignated oil, natural gas and NGL derivatives	$ (161)	$ 167	$ 573	$ 141
Revenues	975	2,087	4,037	6,669
Oil, natural gas and NGL sales
Derivative [Line Items]
Losses on terminated cash flow hedges	(7)	(8)	(24)	(26)
Oil, natural gas and NGL sales | Commodity contract | Not designated as hedging instrument
Derivative [Line Items]
Gains (losses) on undesignated oil, natural gas and NGL derivatives	(154)	175	597	167
Oil, natural gas and NGL
Derivative [Line Items]
Oil, natural gas and NGL revenues	672	1,003	2,006	3,412
Revenues	$ 511	$ 1,170	$ 2,579	$ 3,553

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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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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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