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Fair Value of Financial Instruments - Significant Unobservable Inputs (Details) - Fair Value, Recurring - Energy Related Derivative - Level 3 $ in Millions | Sep. 30, 2020 USD ($) $ / MWh
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative asset | $ | $ 0
Derivative liability | $ | $ (17)
Low | Measurement Input, Commodity Forward Price | Valuation Technique, Discounted Cash Flow |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative liability measurement input | 9.21
High | Measurement Input, Commodity Forward Price | Valuation Technique, Discounted Cash Flow |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative liability measurement input | 37.46
Weighted Average | Measurement Input, Commodity Forward Price | Valuation Technique, Discounted Cash Flow |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative liability measurement input | 16.32

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