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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, 2021 | Dec. 31, 2020
Public Service Company of New Mexico | Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rates | $ (19,989) | $ 44,960
Demographic experience | 617 | 2,607
Mortality rate | 0 | 0
Other assumptions and experience | 0 | 0
Actuarial (gain) loss | (19,372) | 47,567
Public Service Company of New Mexico | Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rates | (2,042) | 4,959
Demographic experience | (2,893) | (1,698)
Assumed participation rate | 0 | 0
Mortality rate | 0 | 0
Dental trend assumption | (118) | 0
Actuarial (gain) loss | (5,053) | 3,261
Texas-New Mexico Power Company | Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rates | (2,017) | 4,756
Demographic experience | (1,403) | (54)
Mortality rate | 0 | 0
Other assumptions and experience | 114 | (243)
Actuarial (gain) loss | (3,306) | 4,459
Texas-New Mexico Power Company | Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rates | (423) | 1,008
Demographic experience | (718) | (261)
Assumed participation rate | 0 | 0
Mortality rate | 0 | 0
Dental trend assumption | 0 | 0
Actuarial (gain) loss | $ (1,141) | $ 747

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- Definition Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Dental Trend Assumption + References No definition available. + Details
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- Definition Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Participation Rate + References No definition available. + Details
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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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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