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Financing, Financing Activities (Details) (USD $) |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |  |  | 3 Months Ended |
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Public Service Company of New Mexico [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] | Jun. 30, 2014 Local Lines of Credit [Member] Public Service Company of New Mexico [Member] | Jan. 08, 2014 Local Lines of Credit [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Local Lines of Credit [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2014 PNMR Term Loan Agreement [Member] | Dec. 31, 2013 PNMR Term Loan Agreement [Member] | Jun. 30, 2014 PNM 2014 Term Loan Agreement [Member] Public Service Company of New Mexico [Member] | Mar. 05, 2014 PNM 2014 Term Loan Agreement [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2014 2011 Term Loan Agreement, First Mortgage Bonds Due 2014 [Member] Texas-New Mexico Power Company [Member] | Dec. 09, 2013 Bonds [Member] First Mortgage Bonds Due 2024, Series 2014A, at 4 point 03 percent [Member] [Member] Texas-New Mexico Power Company [Member] | Mar. 06, 2013 First Mortgage Bonds [Member] First Mortgage Bonds, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member] | Jun. 30, 2014 Notes Payable to Banks [Member] Texas-New Mexico Power Company [Member] | Apr. 22, 2013 Notes Payable to Banks [Member] PNM Term Loan Agreement [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 175,000,000 |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | 80,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 4.03% |  |  |
Proceeds from Bank Debt |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  | 30,000,000 |
Debt Instrument, Cash for Bond Exchange Conversion |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.14 |  |
Short-term debt | 105,000,000 | 149,200,000 | 0 | 49,200,000 | 0 |  | 0 | 100,000,000 | 100,000,000 |  |  |  |  |  |  | 75,000,000
Debt Instrument, Interest Rate at Period End |  |  |  |  |  |  |  |  |  | 1.10% |  |  |  |  |  |
Debt Instruments, NMPRC Approved credit facility |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |

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- Definition Debt Instrument, Cash for Bond Exchange Conversion + References No definition available. + Details
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- Definition Debt Instruments, NMPRC Approved credit faciltiy + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The cash inflow from bank borrowing during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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