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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Aug. 02, 2024 | Aug. 01, 2024 | Dec. 31, 2023
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 200,000,000 |  |  |  | 200,000,000 |  |  |  | 120,000,000
Payment defaults under agreements | $ 0 |  |  |  | $ 0 |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.3875 | $ 0.3875 | $ 0.3675 | $ 0.3675 | $ 1.1625 | $ 1.1025 |  |  |
Dividends declared on common stock | $ 69,906,000 |  | $ 63,088,000 |  | $ 104,858,000 | $ 94,634,000 |  |  |
TXNM |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  | 200,000,000 | 120,000,000 |
Equity contribution from parent | $ 0 |  | 0 |  | $ 0 | 0 |  |  |
Public Service Company of New Mexico |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 40,000,000 |  |  |  | 40,000,000 |  |  |  | 40,000,000
Equity contribution from parent | $ 0 |  |  |  | $ 55,000,000 | 0 |  |  |
Dividends declared on common stock | $ 0 |  | 0 |  | $ 0 | 0 |  |  |
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 12,000,000 |  |  |  | 12,000,000 |  |  |  | 12,000,000
Dividends declared on common stock | $ 0 |  | $ 0 |  | $ 0 | $ 0 |  |  |

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