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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 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   0  
Estimated future contributions, year five 400,000   $ 400,000  
Pension Plan | PNM | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Assumptions used calculating net periodic benefit cost, discount rate     5.70%  
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   $ 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 100,000 $ 900,000 100,000 1,800,000
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 0 0
Disbursements by employer, year one through four     0  
Executive Retirement Program | PNM        
Defined Benefit Plan Disclosure [Line Items]        
Contributions by employer 200,000 300,000 600,000 600,000
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 $ 0 $ 0