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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Derivative and Hedging Activities Derivative and Hedging Activities - Oil, Natural Gas and NGL Revenues Table (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Revenues	$ 2,255		$ 2,281		$ 4,744	$ 5,034
Gains (losses) on undesignated oil, natural gas and NGL derivatives	(251)				(368)
Oil, Natural Gas and NGL Sales [Member]
Derivative [Line Items]
Losses on terminated cash flow hedges	(7)		(7)		(17)	(17)
Oil, Natural Gas and NGL Sales [Member] \| Commodity contract [Member] \| Not designated as hedging instrument [Member]
Derivative [Line Items]
Gains (losses) on undesignated oil, natural gas and NGL derivatives	(244)		207		(351)	539
Oil, natrual gas and NGL [Member]
Derivative [Line Items]
Revenues	$ 982	$ 1,233	$ 1,279	$ 1,079	$ 2,225	$ 2,748	$ 2,593	$ 2,226