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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)	Sep. 30, 2025	Dec. 31, 2024
Weighted average remaining lease term (years):
Operating leases	17 years 5 months 12 days	17 years 5 months 12 days
Financing leases	3 years 4 months 28 days	3 years 2 months 12 days
Weighted average discount rate:
Operating leases	5.73%	5.68%
Financing leases	5.38%	5.12%
PNM
Weighted average remaining lease term (years):
Operating leases	17 years 5 months 23 days	17 years 6 months 7 days
Financing leases	3 years 6 months 7 days	3 years 6 months 3 days
Weighted average discount rate:
Operating leases	5.73%	5.68%
Financing leases	5.32%	5.08%
TNMP
Weighted average remaining lease term (years):
Operating leases	8 months 23 days	1 year 1 month 6 days
Financing leases	3 years 4 months 2 days	2 years 9 months 18 days
Weighted average discount rate:
Operating leases	4.62%	4.41%
Financing leases	5.46%	5.19%

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

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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