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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Weighted Average Discount Rates (Details)	Dec. 31, 2024	Dec. 31, 2023
Weighted average remaining lease term (years):
Operating leases	17 years 5 months 12 days	16 years 7 months 24 days
Financing leases	3 years 2 months 12 days	3 years 5 months 12 days
Weighted average discount rate:
Operating leases	5.68%	5.60%
Financing leases	5.12%	4.58%
PNM
Weighted average remaining lease term (years):
Operating leases	17 years 6 months 7 days	16 years 9 months 14 days
Financing leases	3 years 6 months 3 days	3 years 9 months 21 days
Weighted average discount rate:
Operating leases	5.68%	5.61%
Financing leases	5.08%	4.54%
TNMP
Weighted average remaining lease term (years):
Operating leases	1 year 1 month 6 days	1 year 7 months 24 days
Financing leases	2 years 9 months 18 days	3 years 29 days
Weighted average discount rate:
Operating leases	4.41%	4.16%
Financing leases	5.19%	4.63%

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Weighted average discount rate for finance lease calculated at point in time.

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