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Pension and Other Postretirement Benefits - Assumptions Used (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Expected return on plan assets 4.00%    
Public Service Company of New Mexico | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining PBO and APBO 3.00% 2.66% 3.42%
Discount rate for determining net periodic benefit cost (income) 2.66% 3.42% 4.65%
Expected return on plan assets 5.50% 5.90% 6.86%
Public Service Company of New Mexico | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining PBO and APBO 2.99% 2.65% 3.42%
Discount rate for determining net periodic benefit cost (income) 2.65% 3.42% 4.63%
Expected return on plan assets 4.75% 7.00% 7.20%
Public Service Company of New Mexico | Executive Retirement Program      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining PBO and APBO 3.02% 2.68% 3.44%
Discount rate for determining net periodic benefit cost (income) 2.68% 3.44% 4.66%
Texas-New Mexico Power Company | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining PBO and APBO 3.01% 2.69% 3.46%
Discount rate for determining net periodic benefit cost (income) 2.69% 3.46% 4.63%
Expected return on plan assets 5.50% 5.90% 6.90%
Texas-New Mexico Power Company | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining PBO and APBO 2.99% 2.65% 3.42%
Discount rate for determining net periodic benefit cost (income) 2.65% 3.42% 4.63%
Expected return on plan assets 3.80% 5.60% 5.80%
Texas-New Mexico Power Company | Executive Retirement Program      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining PBO and APBO 3.01% 2.69% 3.46%
Discount rate for determining net periodic benefit cost (income) 2.69% 3.46% 4.63%