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Electric Operating Revenues - Narrative (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) utility	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Number of regulated utilities | utility	2
Other receivables, allowance for credit loss, period increase	$ 0	$ 0
Contract assets	14,500,000		$ 11,900,000
PNM
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 99,600,000		$ 151,400,000

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Carrying amount as of the balance sheet date of the asset arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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