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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2024 | Aug. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Subsequent Event [Line Items] |  |  |  |  |  |
Payment defaults under agreements |  |  | $ 0 |  | $ 0 |
Dividends declared per common share (in dollars per share) |  | $ 0.3675 | $ 0.3875 | $ 0.3675 | $ 0.7750 | $ 0.7350
Dividends declared on common stock |  |  |  |  | $ 34,952,000 | $ 31,545,000
PNMR |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Equity contribution from parent |  |  | $ 55,000,000 | $ 0 | 55,000,000 | 0
Texas-New Mexico Power Company |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends declared on common stock |  |  | 0 | 0 | 0 | 0
Public Service Company of New Mexico |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Equity contribution from parent |  |  |  |  | 55,000,000 | 0
Dividends declared on common stock |  |  | $ 0 | $ 0 | $ 0 | $ 0
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.3875 |  |  |  |  |

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