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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)	Dec. 31, 2019
Weighted average remaining lease term (years):
Operating leases	6 years 5 months 26 days
Financing leases	5 years 6 months 14 days
Weighted average discount rate:
Operating leases	3.90%
Financing leases	3.64%
Public Service Company of New Mexico
Weighted average remaining lease term (years):
Operating leases	6 years 8 months 12 days
Financing leases	5 years 7 months 20 days
Weighted average discount rate:
Operating leases	3.89%
Financing leases	3.68%
Texas-New Mexico Power Company
Weighted average remaining lease term (years):
Operating leases	4 years 1 month 6 days
Financing leases	5 years 6 months 14 days
Weighted average discount rate:
Operating leases	3.95%
Financing leases	3.65%

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

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