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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)	Sep. 30, 2023
Weighted average remaining lease term (years):
Operating leases	16 years 11 months 1 day
Financing leases	3 years 6 months 10 days
Weighted average discount rate:
Operating leases	5.60%
Financing leases	4.34%
PNM
Weighted average remaining lease term (years):
Operating leases	17 years 29 days
Financing leases	3 years 10 months 28 days
Weighted average discount rate:
Operating leases	5.61%
Financing leases	4.43%
TNMP
Weighted average remaining lease term (years):
Operating leases	1 year 10 months 2 days
Financing leases	3 years 29 days
Weighted average discount rate:
Operating leases	4.15%
Financing leases	4.24%

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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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