Derivative and Hedging Activities - Oil, Natural Gas and NGL Revenues (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Gains on undesignated oil, natural gas and NGL derivatives	$ 5	$ (34)
Total oil, natural gas and NGL revenues	8,595	10,030	$ 10,039
Oil, natural gas and NGL sales
Derivative [Line Items]
Losses on terminated cash flow hedges	(35)	(34)	(34)
Oil, Natural Gas and NGL
Derivative [Line Items]
Oil, natural gas and NGL revenues	4,517	5,189	4,574
Total oil, natural gas and NGL revenues	4,522	5,155	4,985
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	$ 40	$ 0	$ 445

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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