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Derivative and Financial Instruments - Commodity Notional (Details) - Commodity Contract [Member] - Bcfe | Sep. 30, 2018 | Dec. 31, 2017
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Natural gas and power, Fixed price [Member] | Short [Member] |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |
Commodity derivatives - volumetric material net exposures | 19 | 29
Natural gas and power, Basis [Member] | Long [Member] |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |
Commodity derivatives - volumetric material net exposures | 5 | 12

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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