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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)	Jun. 30, 2023
Weighted average remaining lease term (years):
Operating leases	7 years 5 months 4 days
Financing leases	3 years 6 months 29 days
Weighted average discount rate:
Operating leases	4.08%
Financing leases	4.08%
PNM
Weighted average remaining lease term (years):
Operating leases	7 years 9 months
Financing leases	3 years 11 months 26 days
Weighted average discount rate:
Operating leases	4.07%
Financing leases	4.24%
TNMP
Weighted average remaining lease term (years):
Operating leases	1 year 11 months 26 days
Financing leases	3 years 1 month 2 days
Weighted average discount rate:
Operating leases	4.13%
Financing leases	3.90%

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