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Risk Management - Energy Commodity Price Risk Management (Details) - Short - Energy commodity derivative contracts | 12 Months Ended
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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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