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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
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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- Definition

Value of input used to measure net derivative asset (liability).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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