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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Pension Plan | PNM    
Defined Benefit Plan Disclosure [Line Items]    
Contributions by employer $ 0 $ 0
Expected employer contributions, remainder of fiscal year $ 0  
Pension Plan | PNM | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Assumptions used calculating net periodic benefit cost, discount rate 2.90%  
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 5 $ 0  
Pension Plan | Texas-New Mexico Power Company | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Assumptions used calculating net periodic benefit cost, discount rate 2.90%  
OPEB Plan | PNM    
Defined Benefit Plan Disclosure [Line Items]    
Contributions by employer $ 0 0
Disbursements by employer 900,000 900,000
Disbursements by employer, remainder of fiscal year 3,200,000  
Disbursements by employer, after current year 11,900,000  
OPEB 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 5 0  
Executive Retirement Program | PNM    
Defined Benefit Plan Disclosure [Line Items]    
Disbursements by employer   400,000
Disbursements by employer, remainder of year 1,300,000  
Disbursements by employer, after current year 4,700,000  
Executive Retirement Program | Texas-New Mexico Power Company    
Defined Benefit Plan Disclosure [Line Items]    
Disbursements by employer, remainder of year 100,000  
Executive Retirement Program | Texas-New Mexico Power Company | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Disbursements by employer $ 0 $ 0