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v3.19.3.a.u2

Stockholders' Equity (Details) - USD ($) |  | 1 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 26, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |
Payment of dividends |  |  |  |  | $ 257,600,000 |  |
Line of Credit |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt-to-capital ratio (not more than) | 70.00% |  | 65.00% | 65.00% | 70.00% |  |
Public Service Company of New Mexico |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Equity contribution from parent |  |  |  |  | $ 0 | $ 0 | $ 0
Payment of dividends |  |  |  |  | $ 283,500,000 |  |
Preferred stock, dividend rate |  |  |  |  | 4.58% |  |
Preferred stock, redemption percent |  |  |  |  | 102.00% |  |
Preferred stock outstanding (in shares) |  |  |  |  | 115,293 | 115,293 |
Preferred stock, cumulative shares authorized (in shares) |  |  |  |  | 10,000,000 | 10,000,000 |
Public Service Company of New Mexico | Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Requirement to obtain approval to transfer more than a percentage of PNM's assets |  |  |  |  | 5.00% |  |
Public Service Company of New Mexico | Line of Credit |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt-to-capital ratio (not more than) |  |  |  |  | 65.00% |  |
Public Service Company of New Mexico | Affiliated Entity |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash dividends paid to parent company by consolidated subsidiaries |  |  |  |  | $ 0 | $ 77,400,000 | 60,700,000
Texas-New Mexico Power Company |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Equity contribution from parent |  |  |  |  | $ 80,000,000 | 30,000,000 | 50,000,000
Preferred stock, cumulative shares authorized (in shares) |  |  |  |  | 1,000,000 |  |
Texas-New Mexico Power Company | Line of Credit |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt-to-capital ratio (not more than) |  |  |  |  | 65.00% |  |
Texas-New Mexico Power Company | Affiliated Entity |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash dividends paid to parent company by consolidated subsidiaries |  |  |  |  | $ 55,300,000 | $ 41,900,000 | $ 44,400,000
PNMR and TNMP |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock outstanding (in shares) |  |  |  |  | 0 |  |
PNMR and TNMP | Line of Credit |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt-to-capital ratio (not more than) |  | 70.00% |  |  |  |  |

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