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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)
Dec. 31, 2020
Dec. 31, 2019
Weighted average remaining lease term (years):    
Operating leases 6 years 14 days 6 years 5 months 26 days
Financing leases 4 years 9 months 14 days 5 years 6 months 14 days
Weighted average discount rate:    
Operating leases 3.94% 3.90%
Financing leases 2.80% 3.64%
Public Service Company of New Mexico    
Weighted average remaining lease term (years):    
Operating leases 6 years 2 months 23 days 6 years 8 months 12 days
Financing leases 4 years 9 months 10 days 5 years 7 months 20 days
Weighted average discount rate:    
Operating leases 3.93% 3.89%
Financing leases 2.76% 3.68%
Texas-New Mexico Power Company    
Weighted average remaining lease term (years):    
Operating leases 3 years 5 months 15 days 4 years 1 month 6 days
Financing leases 4 years 10 months 2 days 5 years 6 months 14 days
Weighted average discount rate:    
Operating leases 4.06% 3.95%
Financing leases 2.84% 3.65%