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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)
Dec. 31, 2021
Dec. 31, 2020
Weighted average remaining lease term (years):    
Operating leases 5 years 5 months 8 days 6 years 14 days
Financing leases 4 years 2 months 12 days 4 years 9 months 14 days
Weighted average discount rate:    
Operating leases 3.99% 3.94%
Financing leases 2.65% 2.80%
Public Service Company of New Mexico    
Weighted average remaining lease term (years):    
Operating leases 5 years 7 months 6 days 6 years 2 months 23 days
Financing leases 4 years 3 months 18 days 4 years 9 months 10 days
Weighted average discount rate:    
Operating leases 3.99% 3.93%
Financing leases 2.60% 2.76%
Texas-New Mexico Power Company    
Weighted average remaining lease term (years):    
Operating leases 2 years 10 months 24 days 3 years 5 months 15 days
Financing leases 4 years 1 month 20 days 4 years 10 months 2 days
Weighted average discount rate:    
Operating leases 3.98% 4.06%
Financing leases 2.71% 2.84%