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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)
Dec. 31, 2023
Dec. 31, 2022
Weighted average remaining lease term (years):    
Operating leases 16 years 7 months 24 days 6 years 5 months 23 days
Financing leases 3 years 5 months 12 days 3 years 8 months 4 days
Weighted average discount rate:    
Operating leases 5.60% 4.00%
Financing leases 4.58% 3.44%
PNM    
Weighted average remaining lease term (years):    
Operating leases 16 years 9 months 14 days 6 years 8 months 26 days
Financing leases 3 years 9 months 21 days 3 years 11 months 26 days
Weighted average discount rate:    
Operating leases 5.61% 4.01%
Financing leases 4.54% 3.36%
TNMP    
Weighted average remaining lease term (years):    
Operating leases 1 year 7 months 24 days 2 years 1 month 28 days
Financing leases 3 years 29 days 3 years 4 months 20 days
Weighted average discount rate:    
Operating leases 4.16% 3.94%
Financing leases 4.63% 3.53%