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Fair Value of Derivative and Other Financial Instruments, Margin, Notional Amounts, Credit Rating (Details) (PNMR and PNM [Member], USD $)
Jun. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative, Collateral, Right to Reclaim Cash $ 0  
Contractual Liability 2,740,000 2,398,000
Existing Cash Collateral 0 0
Net Exposure $ 1,663,000 $ 2,152,000
Commodity Contract [Member] | Fair Value Hedging [Member] | Derivative Long Position [Member]
   
Derivative [Line Items]    
Volume positions (Decatherms / MWh) (2,809,507) (3,343,783)