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Accounting for Derivative Instruments - Volumetric Underlying Derivative Transactions (Details) | Dec. 31, 2016 MWh MMBTU | Dec. 31, 2015 MWh MMBTU
--- | --- | ---
Non-trading | Natural Gas |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume buy (sell) | 8,016 | 7,543
Non-trading | Natural Gas Basis |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume buy (sell) | 0 | 455
Non-trading | Electricity |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume buy (sell) | MWh | 3,958 | 1,187
Trading | Natural Gas |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume buy (sell) | (953) | 8
Trading | Natural Gas Basis |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume buy (sell) | (380) | (455)

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- Definition Derivative, Nonmonetary Notional Amount, Energy Measure, Buy (Sell) + References No definition available. + 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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- Details
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- Details
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- Details
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