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Risk Management - Energy Commodity Price Risk Management (Details) - Short [Member] - Energy commodity derivative contracts | 12 Months Ended
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Dec. 31, 2019 Bcf MMBbls
Designated as Hedging Instrument | Crude Oil Fixed Price |
Derivative [Line Items] |
Net open position long/(short) | (19.6)
Designated as Hedging Instrument | Crude Oil Basis |
Derivative [Line Items] |
Net open position long/(short) | (7.2)
Designated as Hedging Instrument | Natural Gas Fixed Price |
Derivative [Line Items] |
Net open position long/(short) | Bcf | (30.8)
Designated as Hedging Instrument | Natural Gas Basis |
Derivative [Line Items] |
Net open position long/(short) | Bcf | (22.3)
Designated as Hedging Instrument | NGL Fixed Price |
Derivative [Line Items] |
Net open position long/(short) | (1.3)
Not Designated as Hedging Instrument | Crude Oil Fixed Price |
Derivative [Line Items] |
Net open position long/(short) | (0.8)
Not Designated as Hedging Instrument | Crude Oil Basis |
Derivative [Line Items] |
Net open position long/(short) | (4.1)
Not Designated as Hedging Instrument | Natural Gas Fixed Price |
Derivative [Line Items] |
Net open position long/(short) | Bcf | (5.2)
Not Designated as Hedging Instrument | Natural Gas Basis |
Derivative [Line Items] |
Net open position long/(short) | Bcf | (8.8)
Not Designated as Hedging Instrument | NGL Fixed Price |
Derivative [Line Items] |
Net open position long/(short) | (1.9)

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