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Fair Value of Derivative and Other Financial Instruments, Defined Benefit Plans Disclosure (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Private Equity, Hedge and Real Estate Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 93,188 $ 98,688 $ 92,599
Actual return on assets sold during the period 2,824    
Actual return on assets still held at period end 2,565 1,647  
Purchases 5,911 4,725  
Sales (16,800) (2,187)  
Estimate of Fair Value, Fair Value Disclosure [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 1,969,362 1,873,002  
Investment in PVNGS lessor notes 84,198 108,742  
Other investments 6,965 14,208  
Defined Benefit Plan, Fair Value of Plan Assets 583,688 506,605  
Estimate of Fair Value, Fair Value Disclosure [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 1,385,433 1,294,846  
Investment in PVNGS lessor notes 84,198 108,742  
Other investments 494 3,052  
Estimate of Fair Value, Fair Value Disclosure [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 418,166 413,966  
Other investments 281 271  
Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and Cash Equivalents [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 10,404 6,753  
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, International Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 39,867 37,173  
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Value [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 39,492 58,350  
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Growth [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 63,888 65,004  
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Other [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 17,035 15,271  
Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed Income Securities, Corporate [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 101,936 59,730  
Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed Income Securities, U.S. Government [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 148,341 104,102  
Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed Income Securities, Municipals [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,639 3,478  
Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed Income Securities, Other Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 65,898 58,056  
Estimate of Fair Value, Fair Value Disclosure [Member] | Private Equity Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 38,212 37,100  
Estimate of Fair Value, Fair Value Disclosure [Member] | Hedge Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 31,277 36,904  
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 23,699 24,684  
Fair Value, Inputs, Level 1 [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 0 [1]    
Investment in PVNGS lessor notes 0 [1]    
Other investments 774 [1]    
Defined Benefit Plan, Fair Value of Plan Assets 231,953 200,397  
Fair Value, Inputs, Level 1 [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 0 [1]    
Investment in PVNGS lessor notes 0 [1]    
Other investments 494 [1]    
Fair Value, Inputs, Level 1 [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 0 [1]    
Other investments 281 [1]    
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 10,404 6,753  
Fair Value, Inputs, Level 1 [Member] | Equity Securities, International Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 39,867 37,173  
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Value [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 39,492 57,437  
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Growth [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 63,888 65,004  
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Other [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities, Corporate [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities, U.S. Government [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 78,302 34,030  
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities, Municipals [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities, Other Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Hedge Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 1,966,725 [1]    
Investment in PVNGS lessor notes 0 [1]    
Other investments 0 [1]    
Defined Benefit Plan, Fair Value of Plan Assets 258,547 207,520  
Fair Value, Inputs, Level 2 [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 1,385,433 [1]    
Investment in PVNGS lessor notes 0 [1]    
Other investments 0 [1]    
Fair Value, Inputs, Level 2 [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 418,166 [1]    
Other investments 0 [1]    
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Equity Securities, International Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Value [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 913  
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Growth [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Other [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 17,035 15,271  
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities, Corporate [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 101,936 59,730  
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities, U.S. Government [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 70,039 70,072  
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities, Municipals [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,639 3,478  
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities, Other Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 65,898 58,056  
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Hedge Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 2,637 [1]    
Investment in PVNGS lessor notes 84,198 [1]    
Other investments 6,191 [1]    
Defined Benefit Plan, Fair Value of Plan Assets 93,188 98,688  
Fair Value, Inputs, Level 3 [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 0 [1]    
Investment in PVNGS lessor notes 84,198 [1]    
Other investments 0 [1]    
Fair Value, Inputs, Level 3 [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 0 [1]    
Other investments 0 [1]    
Fair Value, Inputs, Level 3 [Member] | PNMR Master Trust [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 79,017 84,133 78,940
Actual return on assets sold during the period 2,627 1,624  
Actual return on assets still held at period end 2,386 1,404  
Purchases 5,498 4,030  
Sales (15,627) (1,865)  
Fair Value, Inputs, Level 3 [Member] | PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 14,171 14,555 13,659
Actual return on assets sold during the period 197 280  
Actual return on assets still held at period end 179 243  
Purchases 413 695  
Sales (1,173) (322)  
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Equity Securities, International Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Value [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Growth [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Other [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities, Corporate [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities, U.S. Government [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities, Municipals [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities, Other Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 38,212 37,100 32,935
Actual return on assets sold during the period 2,966 1,904  
Actual return on assets still held at period end 40 2,372  
Purchases 3,906 2,076  
Sales (5,800) (2,187)  
Fair Value, Inputs, Level 3 [Member] | Hedge Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 31,277 36,904 37,622
Actual return on assets sold during the period (80) 0  
Actual return on assets still held at period end 2,453 (718)  
Purchases 0 0  
Sales (8,000) 0  
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 23,699 24,684 22,042
Actual return on assets sold during the period (62) 0  
Actual return on assets still held at period end 72 (7)  
Purchases 2,005 2,649  
Sales (3,000) 0  
Fair Value, Inputs, Level 3 [Member] | Private Equity, Hedge and Real Estate Funds [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Actual return on assets sold during the period   1,904  
Pension Plan [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 518,095 427,386 392,788
Pension Plan [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 66,540 59,952 60,387
Pension Plan [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | PNMR Master Trust [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 517,238 444,466  
Pension Plan [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 66,450 62,139  
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | PNMR Master Trust [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 205,491 176,279  
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 26,462 24,118  
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | PNMR Master Trust [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 232,730 184,054  
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 25,817 23,466  
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | PNMR Master Trust [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 79,017 84,133  
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | PNMR Master Trust [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 14,171 14,555  
Other Postretirement Benefits [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 64,464 58,776 61,749
Other Postretirement Benefits [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 8,643 8,303 8,596
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period 65,536 59,857  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period 8,760 8,459  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and Cash Equivalents [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4,976 1,128  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and Cash Equivalents [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 42 180  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, International Funds [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,651 2,740  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, International Funds [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,444 1,248  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Value [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   1,289  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Value [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   551  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Growth [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 46,145 43,016  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Domestic Growth [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,289 738  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Other [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 7,588 7,678  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities, Other [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,660 3,048  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed income securities, Mutual funds [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4,176 4,006  
Other Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fixed income securities, Mutual funds [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,325 2,694  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 28,663 28,638  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,656 4,163  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4,976 1,128  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 42 180  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, International Funds [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, International Funds [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Value [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   1,289  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Value [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   551  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Growth [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 19,511 22,215  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic Growth [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,289 738  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Other [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Other [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed income securities, Mutual funds [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4,176 4,006  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed income securities, Mutual funds [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,325 2,694  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 36,873 31,219  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 5,104 4,296  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, International Funds [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,651 2,740  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, International Funds [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,444 1,248  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Value [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Value [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Growth [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 26,634 20,801  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic Growth [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Other [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 7,588 7,678  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities, Other [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,660 3,048  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed income securities, Mutual funds [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed income securities, Mutual funds [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, International Funds [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, International Funds [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Value [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Value [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Growth [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic Growth [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Other [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities, Other [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed income securities, Mutual funds [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed income securities, Mutual funds [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | PNMR [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 1,672,290 1,674,013  
Investment in PVNGS lessor notes 77,682 107,094  
Other investments 5,599 12,207  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Public Service Company of New Mexico [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 1,215,579 1,215,540  
Investment in PVNGS lessor notes 77,682 107,094  
Other investments 494 2,900  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Long-term debt 311,589 310,963  
Other investments $ 281 $ 271  
[1] GAAP does not require disclosure of the fair value hierarchy information prior to 2012