XML 28 R1.htm IDEA: XBRL DOCUMENT v3.4.0.3
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2016
Apr. 22, 2016
Document Information [Line Items]    
Entity Registrant Name PNM RESOURCES INC  
Entity Central Index Key 0001108426  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Mar. 31, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   79,653,624
Public Service Company of New Mexico [Member]    
Document Information [Line Items]    
Entity Registrant Name PUBLIC SERVICE CO OF NEW MEXICO  
Entity Central Index Key 0000081023  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   39,117,799
Texas-New Mexico Power Company [Member]    
Document Information [Line Items]    
Entity Registrant Name TEXAS NEW MEXICO POWER CO  
Entity Central Index Key 0000022767  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   6,358