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Regulatory and Rate Matters - Electric Rate Case (Details) - Public Service Company of New Mexico [Member] $ in Millions |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 29, 2015 USD ($) | Jul. 31, 2015 | May. 27, 2015 | Sep. 30, 2015 USD ($) | Jun. 25, 2015 utility
2014 Electric Rate Case [Member] |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public utilities, requested rate increase (decrease) |  |  |  | $ 107.4 |
Public utilities, requested return on equity |  |  |  | 10.50% |
Public utilities, average customer bill increase |  |  |  | 7.69% |
Public utilities, percentage of requested rate increase pertaining to infrastructure investments |  |  |  | 92.00% |
Future test year period, period of time following the filing of application for rate increase |  |  | 45 days | 13 months |
Public utilities, number of other utilities filing appeals (utilities) | utility |  |  |  |  | 2
Requested stay period |  | 30 days |  |  |
2015 Electric Rate Case [Member] |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public utilities, requested rate increase (decrease) | $ 123.5 |  |  |  |
Public utilities, requested return on equity | 10.50% |  |  |  |

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