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Derivatives - Marketing Derivatives and Warrants (Details)	3 Months Ended					6 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2020 MMBbls	Mar. 31, 2020 $ / Barrel	Mar. 31, 2020 $ / MillionCubicFeet	Mar. 31, 2020 Bcf	Jun. 30, 2019 $ / Barrel	Jun. 30, 2019 $ / MillionCubicFeet	Dec. 31, 2019 MMBbls Bcf	Aug. 08, 2019 $ / 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)			41.58	1.25		60.60	2.17
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		29						55
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					122			128
Anadarko \| Common Stock
Outstanding commodity derivatives contracts not designated as hedging instruments
Exercise price of warrant (usd per share) \| $ / shares									$ 62.50