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

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Derivative and Hedging Actitities - Marketing, Gathering and Compression 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)
Revenue from contracts with customers	5,189
Marketing, Gathering And Compression [Member] \| Supply Contract [Member]
Derivative [Line Items]
Gains (losses) on undesignated oil, natural gas and NGL derivatives	0	$ 0	$ (297)
Marketing [Member]
Derivative [Line Items]
Revenues		5,069	4,511	$ 4,881
Gains (losses) on undesignated oil, natural gas and NGL derivatives	7	0	0
Revenue from contracts with customers	$ 5,076	$ 4,511	$ 4,584