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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, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Other current assets	$ 1,096	$ 1,089
Other deferred charges	455	1,507
Derivative asset	1,551	2,596
Other current liabilities	(1,096)	(1,089)
Other deferred credits	(455)	(1,507)
Derivative liability	(1,551)	(2,596)
Net	$ 0	$ 0

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