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Electric Operating Revenues - Narrative (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) utility	Sep. 30, 2022 USD ($)	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	19,500,000		$ 11,900,000
PNM
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 131,000,000		$ 151,400,000

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