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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2022
Aug. 31, 2022
Sep. 30, 2021
Jul. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dividends Payable [Line Items]                
Payment defaults under agreements $ 0       $ 0   $ 0  
Dividends declared per common share (dollars per share) $ 0.3475 $ 0.3475 $ 0.3275 $ 0.3275 $ 0.3475 $ 0.3275 $ 1.0425 $ 0.9825
Dividends declared on common stock         $ 59,655,000 $ 56,222,000 $ 119,311,000 $ 84,333,000
PNMR                
Dividends Payable [Line Items]                
Equity contribution from parent         68,000,000 0 68,000,000 52,000,000
PNM                
Dividends Payable [Line Items]                
Dividends declared on common stock         85,000,000 60,000,000 85,000,000 60,000,000
Texas-New Mexico Power Company                
Dividends Payable [Line Items]                
Equity contribution from parent             68,000,000 52,000,000
Dividends declared on common stock         $ 0 $ 0 $ 0 $ 0