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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)	Sep. 30, 2021
Weighted average remaining lease term (years):
Operating leases	5 years 7 months 24 days
Financing leases	4 years 3 months 25 days
Weighted average discount rate:
Operating leases	3.98%
Financing leases	2.67%
PNM
Weighted average remaining lease term (years):
Operating leases	5 years 9 months 29 days
Financing leases	4 years 3 months 21 days
Weighted average discount rate:
Operating leases	3.99%
Financing leases	2.62%
TNMP
Weighted average remaining lease term (years):
Operating leases	3 years 29 days
Financing leases	4 years 4 months 6 days
Weighted average discount rate:
Operating leases	3.97%
Financing leases	2.72%

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

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