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Derivative and Financial Instruments - Commodity Notional (Details) - Short [Member] - Commodity Contract [Member] - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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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 | (9) | (5)
Natural gas and power, Basis [Member] |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |
Commodity derivatives - volumetric material net exposures | (50) | (23)

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