Derivative and Hedging Actitities - Marketing Revenues Table (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Revenues	$ 1,230	$ 1,360
Losses on undesignated oil, natural gas and NGL derivatives	(301)	(117)
Marketing, Gathering And Compression \| Other contract
Derivative [Line Items]
Losses on undesignated oil, natural gas and NGL derivatives	(2)	0
Marketing
Derivative [Line Items]
Revenues	1,143	1,089
Losses on undesignated oil, natural gas and NGL derivatives	(2)
Revenues	1,233	1,246
Marketing \| Marketing, Gathering And Compression
Derivative [Line Items]
Revenues	$ 1,235	$ 1,246

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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