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Income Taxes - Schedule of Deferred Income Tax Components (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | $ 22,449 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (11,791) |  |
Amortization of excess deferred income tax | (22,859) |  |
Tax effect of mark-to-market adjustments | 474 |  |
Tax effect of excess pension liability | (1,566) |  |
Adjustment for uncertain income tax positions | (17) |  |
Reclassification of unrecognized tax benefits | 17 |  |
Other | (216) |  |
Deferred income tax (benefit) | (13,509) | $ 24,533 | $ 30,747
PNM |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 1,997 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (9,391) |  |
Amortization of excess deferred income tax | (14,252) |  |
Tax effect of mark-to-market adjustments | (1,099) |  |
Tax effect of excess pension liability | (1,566) |  |
Adjustment for uncertain income tax positions | (55) |  |
Reclassification of unrecognized tax benefits | 2,394 |  |
Deferred income tax (benefit) | (21,972) | 29,487 | 27,120
TNMP |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 14,111 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (2,400) |  |
Amortization of excess deferred income tax | (8,607) |  |
Other | (216) |  |
Deferred income tax (benefit) | $ 2,888 | $ (4,556) | $ (253)

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