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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2027
Dec. 31, 2025
Pension Plan            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, expected future employer contributions, year five $ 7,900,000   $ 7,900,000      
Pension Plan | Forecast            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, assumptions used calculating benefit obligation related to anticipated contributions, weighted average discount rate         5.03% 5.31%
Pension Plan | Public Service Company of New Mexico            
Defined Benefit Plan Disclosure [Line Items]            
Contributions by employer 0 $ 0        
Estimated employer contributions for remainder of fiscal year through year four 0   0      
Pension Plan | Public Service Company of New Mexico | Forecast            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, assumptions used calculating benefit obligation related to anticipated contributions, weighted average discount rate         5.05% 5.32%
Pension Plan | Texas-New Mexico Power Company            
Defined Benefit Plan Disclosure [Line Items]            
Contributions by employer 0 0 0 $ 0    
Estimated employer contributions for remainder of fiscal year through year four 0   0      
OPEB Plan | Public Service Company of New Mexico            
Defined Benefit Plan Disclosure [Line Items]            
Contributions by employer 0 0 0 0    
Disbursements by employer 100,000 100,000 100,000 100,000    
Estimated disbursement by employer, current year     2,000,000      
Disbursements by employer, year one through four     11,100,000      
OPEB Plan | Texas-New Mexico Power Company            
Defined Benefit Plan Disclosure [Line Items]            
Contributions by employer 0 0 0 0    
Disbursements by employer, year one through four     0      
Executive Retirement Program | Public Service Company of New Mexico            
Defined Benefit Plan Disclosure [Line Items]            
Contributions by employer $ 200,000 $ 300,000 600,000 $ 600,000    
Estimated disbursement by employer, current year     1,200,000      
Disbursements by employer, year one through four     $ 4,200,000