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Fair Value of Financial Instruments - Significant Unobservable Inputs (Details) - Fair Value, Recurring - Level 3 $ in Millions	Jun. 30, 2022 USD ($) $ / MWh
Commodity Contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset | $	$ 0
Derivative liability | $	$ 353
Commodity Contracts | Low | Measurement Input, Commodity Forward Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset/liability measurement input	21.68
Commodity Contracts | High | Measurement Input, Commodity Forward Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset/liability measurement input	109.37
Commodity Contracts | Weighted Average | Measurement Input, Commodity Forward Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset/liability measurement input	39.23
Other Financial Instruments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset | $	$ 21
Derivative liability | $	$ 0
Other Financial Instruments | Low | Measurement Input, Commodity Forward Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset/liability measurement input	58,539
Other Financial Instruments | High | Measurement Input, Commodity Forward Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset/liability measurement input	117,078
Other Financial Instruments | Weighted Average | Measurement Input, Commodity Forward Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset/liability measurement input	114,223

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

+ References

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