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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)
Sep. 30, 2019
Weighted average remaining lease term (years):  
Operating leases 6 years 6 months 18 days
Financing leases 5 years 8 months 12 days
Weighted average discount rate:  
Operating leases 3.89%
Financing leases 3.82%
PNM  
Weighted average remaining lease term (years):  
Operating leases 6 years 9 months
Financing leases 5 years 9 months 14 days
Weighted average discount rate:  
Operating leases 3.89%
Financing leases 3.77%
TNMP  
Weighted average remaining lease term (years):  
Operating leases 4 years 3 months 29 days
Financing leases 5 years 7 months 24 days
Weighted average discount rate:  
Operating leases 3.92%
Financing leases 3.90%