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Pension and Other Postretirement Benefits Assumptions Used (Details)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Expected return on plan assets 4.00%    
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining December 31 5.27% 4.30% 5.67%
Discount rate for determining net periodic benefit cost (income) 4.30% 5.67% 5.72%
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining December 31 5.21% 4.26% 5.70%
Discount rate for determining net periodic benefit cost (income) 4.26% 5.70% 5.59%
Expected return on plan assets 8.50% 8.50% 8.50%
Public Service Company of New Mexico [Member] | Pension Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining December 31 5.27% 4.30% 5.67%
Discount rate for determining net periodic benefit cost (income) 4.30% 5.67% 5.72%
Expected return on plan assets 7.65% 8.25% 8.50%
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining December 31 5.06% 4.19% 5.69%
Discount rate for determining net periodic benefit cost (income) 4.19% 5.69% 5.50%
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining December 31 5.21% 4.26% 5.70%
Discount rate for determining net periodic benefit cost (income) 4.26% 5.70% 5.59%
Expected return on plan assets 6.50% 6.50% 6.30%
Texas-New Mexico Power Company [Member] | Pension Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for determining December 31 5.06% 4.19% 5.69%
Discount rate for determining net periodic benefit cost (income) 4.19% 5.69% 5.50%
Expected return on plan assets 7.65% 8.25% 8.50%