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Energy Commodity Price Risk Managment (Details) - Energy commodity derivative contracts(a)	Dec. 31, 2017 MMBbls Bcf
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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