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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension Plan | PNM    
Defined Benefit Plan Disclosure [Line Items]    
Contributions by employer $ 0 $ 0
Estimated employer contributions for remainder of fiscal year through year four 0  
Estimated future contributions, year five $ 400,000  
Pension Plan | PNM | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Assumptions used calculating net periodic benefit cost, discount rate 5.80%  
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  
Pension Plan | Texas-New Mexico Power Company | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Assumptions used calculating net periodic benefit cost, discount rate 5.80%  
OPEB Plan | PNM    
Defined Benefit Plan Disclosure [Line Items]    
Contributions by employer $ 0 0
Disbursements by employer 800,000 900,000
Disbursements by employer, year one through four 9,000,000  
Estimated disbursement by employer, current year 200,000  
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 | PNM    
Defined Benefit Plan Disclosure [Line Items]    
Contributions by employer 100,000 400,000
Disbursements by employer, year one through four 4,500,000  
Estimated disbursement by employer, current year 1,300,000  
Executive Retirement Program | Texas-New Mexico Power Company    
Defined Benefit Plan Disclosure [Line Items]    
Disbursements by employer, year one through four 200,000  
Estimated disbursement by employer, current year 100,000  
Executive Retirement Program | Texas-New Mexico Power Company | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Contributions by employer $ 0 $ 0