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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details)
Dec. 31, 2018
USD ($)
MW
Dec. 31, 2017
USD ($)
MW
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]      
Current assets $ 1,083,000 $ 1,088,000  
Deferred charges 2,511,000 3,556,000  
Current liabilities (1,177,000) (1,182,000)  
Long-term liabilities (2,511,000) (3,556,000)  
PNMR and PNM      
Derivatives, Fair Value [Line Items]      
Amounts recognized for the legal right to reclaim cash collateral 0 0  
Amounts posted as cash collateral under margin arrangements 1,000,000 800,000  
Obligations to return cash collateral 1,000,000 900,000  
PNMR and PNM | Designated as hedging instrument | Commodity Contract      
Derivatives, Fair Value [Line Items]      
Current assets 1,083,000 1,088,000  
Deferred charges 2,511,000 3,556,000  
Total assets 3,594,000 4,644,000  
Current liabilities (1,177,000) (1,182,000)  
Long-term liabilities (2,511,000) (3,556,000)  
Total Liabilities (3,688,000) (4,738,000)  
Net $ (94,000) $ (94,000)  
Public Service Company of New Mexico      
Derivatives, Fair Value [Line Items]      
Expected exposure to market risk (in megawatts) | MW 65 65  
Power to be sold to third party (in megawatts) | MW 36 36  
Current assets $ 1,083,000 $ 1,088,000  
Deferred charges 2,511,000 3,556,000  
Current liabilities (1,177,000) (1,182,000)  
Long-term liabilities $ (2,511,000) (3,556,000)  
Other credit derivatives | Public Service Company of New Mexico | Designated as hedging instrument | Commodity Contract      
Derivatives, Fair Value [Line Items]      
Total assets   $ 3,600,000 $ 4,600,000