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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details) - PNM - Designated as Hedging Instrument - Commodity derivatives - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Other current assets	$ 753	$ 1,096
Other deferred charges	0	455
Derivative asset	753	1,551
Other current liabilities	(2,703)	(1,096)
Other deferred credits	0	(455)
Derivative liability	(2,703)	(1,551)
Net	$ (1,950)	$ 0

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