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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Apr. 30, 2024 | Feb. 29, 2024 | Feb. 28, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Subsequent Event [Line Items] |  |  |  |  |
Payment defaults under agreements |  |  |  | $ 0 |
Dividends declared per common share (dollars per share) |  | $ 0.3875 | $ 0.3675 | $ 0.3875 | $ 0.3675
Dividends declared on common stock |  |  |  | $ 34,952,000 | $ 31,545,000
PNMR | Subsequent event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Equity contribution from parent | $ 55,000,000 |  |  |  |
Texas-New Mexico Power Company |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Dividends declared on common stock |  |  |  | $ 0 | $ 0

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