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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details)
Dec. 31, 2017
USD ($)
MW
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]    
Current assets $ 1,088,000 $ 5,224,000
Deferred charges 3,556,000 0
Current liabilities (1,182,000) (2,339,000)
Long-term liabilities (3,556,000) 0
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 800,000 2,600,000
Obligations to return cash collateral 900,000 100,000
PNMR and PNM | Designated as hedging instrument | Commodity Contract    
Derivatives, Fair Value [Line Items]    
Current assets 1,088,000 5,224,000
Deferred charges 3,556,000 0
Total assets 4,644,000 5,224,000
Current liabilities (1,182,000) (2,339,000)
Long-term liabilities (3,556,000) 0
Total Liabilities (4,738,000) (2,339,000)
Net (94,000) 2,885,000
PNMR and PNM | Designated as hedging instrument | Commodity Contract | Palo Verde Nuclear Generating Station    
Derivatives, Fair Value [Line Items]    
Current assets $ 2,700,000  
Public Service Company of New Mexico    
Derivatives, Fair Value [Line Items]    
Expected exposure to market risk (in megawatts) | MW 65  
Power to be sold to third party (in megawatts) | MW 36  
Current assets $ 1,088,000 5,224,000
Deferred charges 3,556,000 0
Current liabilities (1,182,000) (2,339,000)
Long-term liabilities (3,556,000) 0
Public Service Company of New Mexico | Designated as hedging instrument | Commodity Contract | Fuel and Purchased Power Adjustment Clause    
Derivatives, Fair Value [Line Items]    
Current assets   200,000
Current liabilities   (100,000)
Other credit derivatives | Public Service Company of New Mexico | Designated as hedging instrument | Commodity Contract    
Derivatives, Fair Value [Line Items]    
Total assets $ 4,600,000 $ 500,000