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Stockholders' Equity (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 30, 2024 | Dec. 15, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Aug. 02, 2024 | Aug. 01, 2024
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 200,000,000 | 120,000,000 |  |  |
Payment of dividends |  |  | $ 775,000,000.0 |  |  |  |
TXNM 2024 ATM Program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) | 2,458,951 |  |  |  |  |  |
Sale of stock, consideration received on transaction | $ 800,000 |  |  |  |  |  |
Payments of stock issuance costs | $ 98,600,000 |  |  |  |  |  |
Common stock subject to future settlement (in shares) | 1,104,641 |  |  |  |  |  |
TXNM 2022 ATM Program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  | 4,365,510 |  |  |  |  |
Sale of stock, consideration received on transaction | $ 1,000,000 |  |  |  |  |  |
Payments of stock issuance costs | $ 198,200,000 |  |  |  |  |  |
Common stock subject to future settlement (in shares) | 0 |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt-to-capital ratio (not more than) (as a percent) |  |  | 70.00% |  |  |  |
PNM |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 40,000,000 | 40,000,000 |  |  |
Equity contribution from parent |  |  | $ 55,000,000 | $ 0 | $ 0 |  |
Requirement to obtain approval to transfer more than a percentage of PNM's assets |  |  | 5.00% |  |  |  |
Payment of dividends |  |  | $ 509,100,000 |  |  |  |
Preferred stock, dividend rate (as a percent) |  |  | 4.58% |  |  |  |
Preferred stock, redemption (as a 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 |  |  |
PNM | Line of Credit |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt-to-capital ratio (not more than) (as a percent) |  |  | 65.00% |  |  |  |
PNM | Affiliated Entity |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash dividends paid |  |  | $ 51,000,000 | $ 0 | 153,500,000 |  |
TNMP |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 12,000,000 | 12,000,000 |  |  |
Equity contribution from parent |  |  | $ 24,000,000 | $ 40,900,000 | 68,000,000 |  |
Payment of dividends |  |  | $ 318,000,000.0 |  |  |  |
Preferred stock, cumulative shares authorized (in shares) |  |  | 1,000,000 |  |  |  |
TNMP | Line of Credit |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt-to-capital ratio (not more than) (as a percent) |  |  | 65.00% |  |  |  |
TNMP | Affiliated Entity |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash dividends paid |  |  | $ 0 | $ 0 | $ 0 |  |
PNMR and TNMP |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock outstanding (in shares) |  |  | 0 |  |  |  |
TXNM |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  | 200,000,000 | 120,000,000

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