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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Derivative and Hedging Activities - Oil, Natural Gas and NGL Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Gains (losses) on undesignated oil, natural gas and NGL derivatives	$ (34)
Revenues	10,231	$ 9,496	$ 7,872
Oil, Natural Gas and NGL Sales [Member]
Derivative [Line Items]
Losses on terminated cash flow hedges	(34)	(34)	(33)
Oil, Natural Gas and NGL [Member]
Derivative [Line Items]
Results of Operations, Revenue from Oil and Gas Producing Activities		5,189	4,574	$ 3,866
Revenues	5,155	4,985	3,288
Not designated as hedging instrument [Member] \| Oil, Natural Gas and NGL Sales [Member] \| Commodity contract [Member]
Derivative [Line Items]
Gains (losses) on undesignated oil, natural gas and NGL derivatives	$ 0	$ 445	$ (545)