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Risk Management - Energy Commodity Price Risk Management (Details) - Energy commodity derivative contracts	6 Months Ended
	Jun. 30, 2020 MMBbls Bcf
Short | Derivatives designated as hedging instruments | Crude oil fixed price
Derivative [Line Items]
Net open position	21.5
Short | Derivatives designated as hedging instruments | Crude oil basis
Derivative [Line Items]
Net open position	4.1
Short | Derivatives designated as hedging instruments | Natural gas fixed price
Derivative [Line Items]
Net open position | Bcf	42.9
Short | Derivatives designated as hedging instruments | Natural gas basis
Derivative [Line Items]
Net open position | Bcf	43.0
Short | Derivatives designated as hedging instruments | NGL fixed price
Derivative [Line Items]
Net open position	1.1
Short | Derivatives not designated as hedging instruments | Crude oil fixed price
Derivative [Line Items]
Net open position	3.0
Short | Derivatives not designated as hedging instruments | Crude oil basis
Derivative [Line Items]
Net open position	1.7
Short | Derivatives not designated as hedging instruments | Natural gas fixed price
Derivative [Line Items]
Net open position | Bcf	10.7
Short | Derivatives not designated as hedging instruments | NGL fixed price
Derivative [Line Items]
Net open position	1.7
Long | Derivatives not designated as hedging instruments | Natural gas basis
Derivative [Line Items]
Net open position | Bcf	16.1

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