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Derivative and Financial Instruments - Commodity Notional (Details) - Commodity Contract [Member] - Short [Member] - Bcfe Bcfe in Billions | Dec. 31, 2019 | Dec. 31, 2018
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Natural gas and power, Fixed price [Member] |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |
Commodity derivatives - volumetric material net exposures | (5) | (17)
Natural gas and power, Basis [Member] |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |
Commodity derivatives - volumetric material net exposures | (23) | (1)

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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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