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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Business Acquisition [Line Items]            
Payment defaults under agreements     $ 0   $ 0  
Dividends declared per common share (dollars per share)   $ 0.2900 $ 0.308 $ 0.290 $ 0.615 $ 0.580
Dividends declared on common stock       $ 132,000 $ 24,493,000 $ 23,099,000
Subsequent event            
Business Acquisition [Line Items]            
Dividends declared per common share (dollars per share) $ 0.3075          
PNM            
Business Acquisition [Line Items]            
Dividends declared on common stock     $ 40,700,000 0 40,654,000 0
Texas-New Mexico Power Company            
Business Acquisition [Line Items]            
Dividends declared on common stock     $ 7,092,000 $ 4,098,000 $ 18,439,000 $ 14,811,000