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Pension and Other Postretirement Benefits - Actuarial (Gain) Loss Results (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Public Service Company of New Mexico | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates $ (19,989) $ 44,960
Demographic experience 617 2,607
Mortality rate 0 0
Other assumptions and experience 0 0
Actuarial (gain) loss (19,372) 47,567
Public Service Company of New Mexico | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates (2,042) 4,959
Demographic experience (2,893) (1,698)
Assumed participation rate 0 0
Mortality rate 0 0
Dental trend assumption (118) 0
Actuarial (gain) loss (5,053) 3,261
Texas-New Mexico Power Company | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates (2,017) 4,756
Demographic experience (1,403) (54)
Mortality rate 0 0
Other assumptions and experience 114 (243)
Actuarial (gain) loss (3,306) 4,459
Texas-New Mexico Power Company | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates (423) 1,008
Demographic experience (718) (261)
Assumed participation rate 0 0
Mortality rate 0 0
Dental trend assumption 0 0
Actuarial (gain) loss $ (1,141) $ 747