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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 30, 2021
Jul. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Business Acquisition [Line Items]            
Payment defaults under agreements     $ 0   $ 0  
Dividends declared per common share (dollars per share)   $ 0.3075 $ 0.3275 $ 0.3080 $ 0.6550 $ 0.6150
Dividends declared on common stock         $ 28,111,000 $ 24,493,000
Subsequent event            
Business Acquisition [Line Items]            
Dividends declared per common share (dollars per share) $ 0.3275          
PNM            
Business Acquisition [Line Items]            
Dividends declared on common stock       $ 40,700,000   40,654,000
Texas-New Mexico Power Company            
Business Acquisition [Line Items]            
Dividends declared on common stock       $ 7,092,000   $ 18,439,000