Derivative and Hedging Activities Derivative and Hedging Activities - Oil, Natural Gas and NGL Revenues Table (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Gains (losses) on undesignated oil, natural gas and NGL derivatives	$ (132)		$ (500)
Revenues	2,418	$ 1,943	7,162	$ 6,977
Oil, Natural Gas and NGL Sales [Member]
Derivative [Line Items]
Losses on terminated cash flow hedges	(8)	(8)	(25)	(25)
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	(124)	(62)	(475)	477
Oil, natrual gas and NGL [Member]
Derivative [Line Items]
Oil, natural gas and NGL revenues	1,331	1,049	3,924	3,275
Revenues	$ 1,199	$ 979	$ 3,424	$ 3,727

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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