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Pension and Other Postretirement Benefits - Actuarial (Gain) Loss Results (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Public Service Company of New Mexico | Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rates | $ (111,478) | $ (19,989)
Demographic experience | (7,074) | 617
Mortality rate | 0 | 0
Other assumptions and experience | 0 | 0
Actuarial (gain) loss | (118,552) | (19,372)
Public Service Company of New Mexico | Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rates | (11,876) | (2,042)
Demographic experience | (2,985) | (2,893)
Assumed participation rate | 0 | 0
Mortality rate | 0 | 0
Dental trend assumption | 32 | (118)
Actuarial (gain) loss | (14,829) | (5,053)
Texas-New Mexico Power Company | Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rates | (11,697) | (2,017)
Demographic experience | (742) | (1,403)
Mortality rate | 0 | 0
Other assumptions and experience | 728 | 114
Actuarial (gain) loss | (11,711) | (3,306)
Texas-New Mexico Power Company | Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rates | (2,469) | (423)
Demographic experience | (319) | (718)
Assumed participation rate | 0 | 0
Mortality rate | 0 | 0
Dental trend assumption | 0 | 0
Actuarial (gain) loss | $ (2,788) | $ (1,141)

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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