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Derivative Instrument Balance Sheet (Details) bbl in Millions, MMBTU in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020 MMBTU bbl	Dec. 31, 2019 MMBTU bbl
Crude Oil [Member] \| Long [Member]
Net notional long / short position of derivative instruments bbl		57
Crude Oil [Member] \| Short [Member]
Net notional long / short position of derivative instruments bbl	32
Products [Member] \| Short [Member]
Net notional long / short position of derivative instruments bbl	53	38
Natural Gas [Member] \| Short [Member]
Net notional long / short position of derivative instruments MMBtus \| MMBTU	351	165