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Derivative Financial Instruments - Volume of Commodity Derivative Activity (Details) - Not Designated as Hedging Instrument [Member] - Commodity contracts | Mar. 31, 2018 MMBTU gal
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Short |
Derivative [Line Items] |
Nonmonetary Notional Amount of Price Risk Derivatives of Natural Gas Liquids | gal | 7,696,503
Long |
Derivative [Line Items] |
Nonmonetary Notional Amount of Price Risk Derivatives Of Natural Gas | MMBTU | 745,045

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- Definition Aggregate notional amount of natural gas liquids price risk derivatives for instruments with notional amounts expressed in nonmonetary units. + References No definition available. + Details
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