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Risk Management Energy Commodity Price Risk Management (Details) - Energy commodity derivative contracts(a)	Jun. 30, 2016 MMBbls Bcf
Crude oil fixed price | Derivatives designated as hedging contracts
Derivative [Line Items]
Derivative, Net Nonmonetary Notional Amounts	(21.2)
Crude oil fixed price | Derivatives not designated as hedging contracts
Derivative [Line Items]
Derivative, Net Nonmonetary Notional Amounts	(0.3)
Crude oil basis | Derivatives designated as hedging contracts
Derivative [Line Items]
Derivative, Net Nonmonetary Notional Amounts	(4.1)
Crude oil basis | Derivatives not designated as hedging contracts
Derivative [Line Items]
Derivative, Net Nonmonetary Notional Amounts	(0.4)
Natural gas fixed price | Derivatives designated as hedging contracts
Derivative [Line Items]
Derivative, Net Nonmonetary Notional Amounts | Bcf	(31.9)
Natural gas fixed price | Derivatives not designated as hedging contracts
Derivative [Line Items]
Derivative, Net Nonmonetary Notional Amounts | Bcf	(12.8)
Natural gas basis | Derivatives designated as hedging contracts
Derivative [Line Items]
Derivative, Net Nonmonetary Notional Amounts | Bcf	(21.8)
Natural gas basis | Derivatives not designated as hedging contracts
Derivative [Line Items]
Derivative, Net Nonmonetary Notional Amounts | Bcf	(2.6)
NGL and other fixed price | Derivatives not designated as hedging contracts
Derivative [Line Items]
Derivative, Net Nonmonetary Notional Amounts	(3.4)

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Derivative, Net Nonmonetary Notional Amounts

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