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Pension and Other Postretirement Benefits - Actuarial (Gain) Loss Results (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Public Service Company of New Mexico | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates $ (111,478) $ (19,989)
Demographic experience (7,074) 617
Mortality rate 0 0
Other assumptions and experience 0 0
Actuarial (gain) loss (118,552) (19,372)
Public Service Company of New Mexico | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates (11,876) (2,042)
Demographic experience (2,985) (2,893)
Assumed participation rate 0 0
Mortality rate 0 0
Dental trend assumption 32 (118)
Actuarial (gain) loss (14,829) (5,053)
Texas-New Mexico Power Company | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates (11,697) (2,017)
Demographic experience (742) (1,403)
Mortality rate 0 0
Other assumptions and experience 728 114
Actuarial (gain) loss (11,711) (3,306)
Texas-New Mexico Power Company | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates (2,469) (423)
Demographic experience (319) (718)
Assumed participation rate 0 0
Mortality rate 0 0
Dental trend assumption 0 0
Actuarial (gain) loss $ (2,788) $ (1,141)