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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, 2020
Jul. 31, 2020
Sep. 30, 2019
Jul. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition [Line Items]                
Payment defaults under agreements $ 0       $ 0   $ 0  
Dividends declared per common share (dollars per share) $ 0.3075 $ 0.3075 $ 0.290 $ 0.290 $ 0.3075 $ 0.2900 $ 0.9225 $ 0.8700
Dividends declared on common stock         $ 48,987,000 $ 46,200,000 $ 73,480,000 $ 69,299,000
PNM                
Business Acquisition [Line Items]                
Dividends declared on common stock         0 0 40,654,000 0
Texas-New Mexico Power Company                
Business Acquisition [Line Items]                
Dividends declared on common stock         $ 16,174,000 $ 15,367,000 $ 34,613,000 $ 30,178,000