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Accounting Policies - Derivatives (Details 11) - MMBTU | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Commodity Contract [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | 450,000 | 1,400,000

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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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- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
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- Details
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- Details
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