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Commitments and Contingencies (Other Commitments and Contingencies) (Details) (USD $) |  |  |  |  |  |  |  |  |  | 3 Months Ended |  |  |  |  |
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Public Service Company of New Mexico [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] | Mar. 31, 2014 San Juan Generating Station [Member] Public Service Company of New Mexico [Member] Coal Supply [Member] | Dec. 31, 2013 San Juan Generating Station [Member] Public Service Company of New Mexico [Member] Coal Supply [Member] | Mar. 31, 2014 Surface [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Nuclear Plant [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Apr. 01, 2014 Nuclear Plant [Member] Maximum [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Nuclear Plant [Member] Maximum [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Nuclear Plant [Member] Commercial Providers [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Nuclear Plant [Member] Industry Wide Retrospective Assessment Program [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Loss on Long-term Purchase Commitment [Member] Surface [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Loss on Long-term Purchase Commitment [Member] Surface [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Loss on Long-term Purchase Commitment [Member] Surface [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Loss on Long-term Purchase Commitment [Member] Underground [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Loss on Long-term Purchase Commitment [Member] Underground [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Loss on Long-term Purchase Commitment [Member] Underground [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 San Juan Underground Mine Fire [Member] Fuel and Purchased Power Adjustment Clause [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 San Juan Underground Mine Fire [Member] Maximum [Member] Fuel and Purchased Power Adjustment Clause [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 San Juan Underground Mine Fire [Member] Minimum [Member] Fuel and Purchased Power Adjustment Clause [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Continuous Highwall Mining [Member] San Juan Generating Station [Member] | Mar. 31, 2014 SJCC Arbitration [Member] San Juan Generating Station [Member] | Mar. 31, 2014 SJCC Arbitration [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 NMTRD Coal Severance Tax [Member] Four Corners [Member] | Mar. 31, 2014 NMTRD Coal Severance Tax [Member] Four Corners [Member] Public Service Company of New Mexico [Member] | Jan. 06, 2014 Navajo Nation Allottee Matters [Member] Public Service Company of New Mexico [Member] Allotment_Parcel
Public Utilities, Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current assets | $ 44,689,000 | $ 34,590,000 | $ 40,498,000 | $ 30,510,000 | $ 16,000,000 | $ 12,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Estimated Increase in Coal Cost, Percentage |  |  |  |  | 21.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final Reclamation, capped amount to be collected |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preliminary estimate increased deferral related to mine fire incident |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,600,000 | 17,400,000 |  |  |  |  |  |
Public Utilities, Insurance Recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,700,000 |  |  |  |  |  |  |  |
Public Utilities, Proposed Retroactive Surface Mining Royalty Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% |  |  |  |  |
Public Utilities, Current Surface Mining Royalty Rate applied between 2000 and 2003 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |
Public Utilities, Estimated Underpaid Surface Mining Royalties under proposed rate change |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |
Public Utilities, PNM Share Estimated Underpaid Surface Mining Royalties under proposed rate change |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46.30% |  |  |  |  |
Public Utilities, Potential Unbilled Mining Costs Owed to SJCC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,200,000.0 |  |  |  |
Public Utilities, Potential Overbilled Mining Costs SJCC Owes to SJGS Owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000.0 |  |  |  |
Public Utilities, Potential Capital Improvements billed as Mining Costs to SJGS Owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,900,000.0 |  |  |  |
Public Utilities, PNM Share of arbitration ruling |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46.30% |  |  |
Public Utilities, FFPAC Percentage of mining costs overbilled or unbilled ruled by arbitration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |
Public Utilities, FFPAC Percentage of capital improvements billed as mining costs ruled by arbitration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Public Utilities, Assessed Coal Severance Surtax Penalty and Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |
Public Utilities, PNM Share Assessed Coal Severance Surtax Penalty and Interest to pass through FFPAC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |
Public Utilities, Liability Insurance Coverage |  |  |  |  |  |  |  |  |  | 13,600,000,000 | 375,000,000 | 13,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Ownership Percentage in Nuclear Reactor |  |  |  |  |  |  |  | 10.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Maximum Potential Assessment Per Incident |  |  |  |  |  |  |  | 38,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Annual Payment Limitation Related to Incident |  |  |  |  |  |  |  | 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Aggregate Amount of All Risk Insurance |  |  |  |  |  |  |  | 2,750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Liability Insurance Coverage Sublimit |  |  |  |  |  |  |  |  | 2,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Maximum Amount under Nuclear Electric Insurance Limited |  |  |  |  |  |  |  | 4,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,100,000 |  |  | 93,300,000 |  |  |  |  |  |  |  |  |
Loss Contingency Accrual, at Carrying Value |  |  |  |  |  |  |  |  |  |  |  |  | 23,600,000 | 23,800,000 |  | 7,900,000 | 7,800,000 |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of allotment parcels' appraisal requested for review |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58

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