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Energy Commodity Price Risk Managment (Details) - Energy commodity derivative contracts(a) | Dec. 31, 2017 MMBbls Bcf
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Designated as Hedging Instrument [Member] | Crude Oil Fixed Price [Member] |
Derivative [Line Items] |
Net Open Position Long/(Short) of Outstanding Commodity Forward Contracts to Hedge our Forecasted Energy Commodity Purchases and Sales | (21.0)
Designated as Hedging Instrument [Member] | Crude Oil Basis [Member] |
Derivative [Line Items] |
Net Open Position Long/(Short) of Outstanding Commodity Forward Contracts to Hedge our Forecasted Energy Commodity Purchases and Sales | (7.2)
Designated as Hedging Instrument [Member] | Natural Gas Fixed Price [Member] |
Derivative [Line Items] |
Net Open Position Long/(Short) of Outstanding Commodity Forward Contracts to Hedge our Forecasted Energy Commodity Purchases and Sales | Bcf | (46.4)
Designated as Hedging Instrument [Member] | Natural Gas Basis [Member] |
Derivative [Line Items] |
Net Open Position Long/(Short) of Outstanding Commodity Forward Contracts to Hedge our Forecasted Energy Commodity Purchases and Sales | Bcf | (21.7)
Not Designated as Hedging Instrument [Member] | Crude Oil Fixed Price [Member] |
Derivative [Line Items] |
Net Open Position Long/(Short) of Outstanding Commodity Forward Contracts to Hedge our Forecasted Energy Commodity Purchases and Sales | (1.9)
Not Designated as Hedging Instrument [Member] | Crude Oil Basis [Member] |
Derivative [Line Items] |
Net Open Position Long/(Short) of Outstanding Commodity Forward Contracts to Hedge our Forecasted Energy Commodity Purchases and Sales | (1.2)
Not Designated as Hedging Instrument [Member] | Natural Gas Fixed Price [Member] |
Derivative [Line Items] |
Net Open Position Long/(Short) of Outstanding Commodity Forward Contracts to Hedge our Forecasted Energy Commodity Purchases and Sales | Bcf | (9.0)
Not Designated as Hedging Instrument [Member] | Natural Gas Basis [Member] |
Derivative [Line Items] |
Net Open Position Long/(Short) of Outstanding Commodity Forward Contracts to Hedge our Forecasted Energy Commodity Purchases and Sales | Bcf | (23.1)
Not Designated as Hedging Instrument [Member] | NGL and other fixed price |
Derivative [Line Items] |
Net Open Position Long/(Short) of Outstanding Commodity Forward Contracts to Hedge our Forecasted Energy Commodity Purchases and Sales | (4.1)

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