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Risk Management - Energy Commodity Price Risk Management (Details) - Short - Energy commodity derivative contracts	12 Months Ended
	Dec. 31, 2020 MMBbls Bcf
Designated as Hedging Instrument | Crude Oil Fixed Price
Derivative [Line Items]
Net open position	(20.4)
Designated as Hedging Instrument | Crude Oil Basis
Derivative [Line Items]
Net open position	(2.2)
Designated as Hedging Instrument | Natural Gas Fixed Price
Derivative [Line Items]
Net open position | Bcf	(30.1)
Designated as Hedging Instrument | Natural Gas Basis
Derivative [Line Items]
Net open position | Bcf	(20.0)
Designated as Hedging Instrument | NGL Fixed Price
Derivative [Line Items]
Net open position	(1.1)
Not Designated as Hedging Instrument | Crude Oil Fixed Price
Derivative [Line Items]
Net open position	(5.6)
Not Designated as Hedging Instrument | Crude Oil Basis
Derivative [Line Items]
Net open position	(6.8)
Not Designated as Hedging Instrument | Natural Gas Fixed Price
Derivative [Line Items]
Net open position | Bcf	(6.7)
Not Designated as Hedging Instrument | Natural Gas Basis
Derivative [Line Items]
Net open position | Bcf	(5.5)
Not Designated as Hedging Instrument | NGL Fixed Price
Derivative [Line Items]
Net open position	(1.0)

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Nominal volume used to calculate payments on a derivative instrument.

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