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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details) - PNM - Designated as hedging instrument - Commodity Contract - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Other current assets | $ 684 | $ 1,096
Other deferred charges |  | 455
Derivative asset | 684 | 1,551
Other current liabilities | (2,275) | (1,096)
Other deferred credits |  | (455)
Derivative liability | (2,275) | (1,551)
Net | $ (1,591) | $ 0

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