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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)	Mar. 31, 2021
Weighted average remaining lease term (years):
Operating leases	5 years 10 months 20 days
Financing leases	4 years 8 months 1 day
Weighted average discount rate:
Operating leases	3.96%
Financing leases	2.76%
PNM
Weighted average remaining lease term (years):
Operating leases	6 years 25 days
Financing leases	4 years 8 months 12 days
Weighted average discount rate:
Operating leases	3.96%
Financing leases	2.71%
TNMP
Weighted average remaining lease term (years):
Operating leases	3 years 4 months 28 days
Financing leases	4 years 8 months 8 days
Weighted average discount rate:
Operating leases	3.94%
Financing leases	2.81%

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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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