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Derivative Instruments - Marketing Derivatives and Warrants (Details) $ / shares in Units, $ in Millions	9 Months Ended					12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019 Bcf	Sep. 30, 2019 MMBbls	Sep. 30, 2019 $ / MillionCubicFeet	Sep. 30, 2019 $ / Barrel	Dec. 31, 2018 Bcf	Dec. 31, 2018 MMBbls	Dec. 31, 2018 $ / MillionCubicFeet	Dec. 31, 2018 $ / Barrel	Aug. 08, 2019 USD ($) $ / shares
Marketing Derivatives
Outstanding commodity derivatives contracts not designated as hedging instruments
Derivative instrument settlement period (within)	3 months
Marketing Derivatives \| Not designated as hedging instruments
Outstanding commodity derivatives contracts not designated as hedging instruments
Weighted average sales price (dollars per barrel)				2.22	58.39			3.18	58.81
Crude oil \| Not designated as hedging instruments \| Long position
Outstanding commodity derivatives contracts not designated as hedging instruments
Outstanding net volumes on derivatives not designated as hedges (mmbls/bcf) \| MMBbls			36				61
Natural gas \| Not designated as hedging instruments \| Short position
Outstanding commodity derivatives contracts not designated as hedging instruments
Outstanding net volumes on derivatives not designated as hedges (mmbls/bcf) \| Bcf		128				142
Warrant
Outstanding commodity derivatives contracts not designated as hedging instruments
Initial fair value of warrant \| $										$ 188
Anadarko \| Common Stock
Outstanding commodity derivatives contracts not designated as hedging instruments
Exercise price of warrant (usd per share) \| $ / shares										$ 62.50