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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 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      
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      
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    
Estimated employer contributions for remainder of fiscal year through year four 0      
OPEB Plan | Public Service Company of New Mexico        
Defined Benefit Plan Disclosure [Line Items]        
Contributions by employer 0 0    
Disbursements by employer 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    
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 400,000 300,000    
Estimated disbursement by employer, current year 1,200,000      
Disbursements by employer, year one through four 4,200,000      
Executive Retirement Program | Texas-New Mexico Power Company        
Defined Benefit Plan Disclosure [Line Items]        
Contributions by employer 0 $ 100,000    
Disbursements by employer, year one through four $ 0