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Pension and Other Postretirement Benefit Plans Assumptions Used (Details) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected return on plan assets | 4.00% |  |
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate for determining December 31 | 5.69% | 5.50% | 6.31%
Discount rate for determining net periodic benefit cost (income) | 5.50% | 6.31% | 7.25%
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate for determining December 31 | 5.70% | 5.59% | 6.42%
Discount rate for determining net periodic benefit cost (income) | 5.59% | 6.42% | 7.25%
Expected return on plan assets | 6.30% | 6.70% | 6.70%
Texas-New Mexico Power Company [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate for determining December 31 | 5.69% | 5.50% | 6.31%
Discount rate for determining net periodic benefit cost (income) | 5.50% | 6.31% | 7.25%
Expected return on plan assets | 8.50% | 8.75% | 8.75%
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate for determining December 31 | 5.67% | 5.72% | 6.47%
Discount rate for determining net periodic benefit cost (income) | 5.72% | 6.47% | 7.25%
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate for determining December 31 | 5.70% | 5.59% | 6.42%
Discount rate for determining net periodic benefit cost (income) | 5.59% | 6.42% | 7.25%
Expected return on plan assets | 8.50% | 8.75% | 8.75%
Public Service Company of New Mexico [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate for determining December 31 | 5.67% | 5.72% | 6.47%
Discount rate for determining net periodic benefit cost (income) | 5.72% | 6.47% | 7.25%
Expected return on plan assets | 8.50% | 8.75% | 8.75%

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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 -Topic 715 -SubTopic 30 + Details
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