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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Pension Plan | PNM |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions by employer | $ 0 | $ 0
Expected employer contributions, remainder of fiscal year | $ 0 |
Pension Plan | PNM | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assumptions used calculating net periodic benefit cost, discount rate | 2.90% |
Pension Plan | Texas-New Mexico Power Company |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions by employer | $ 0 | 0
Estimated employer contributions for remainder of fiscal year through year 5 | $ 0 |
Pension Plan | Texas-New Mexico Power Company | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assumptions used calculating net periodic benefit cost, discount rate | 2.90% |
OPEB Plan | PNM |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions by employer | $ 0 | 0
Disbursements by employer | 900,000 | 900,000
Disbursements by employer, remainder of fiscal year | 3,200,000 |
Disbursements by employer, after current year | 11,900,000 |
OPEB Plan | Texas-New Mexico Power Company |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions by employer | 0 | 0
Estimated employer contributions for remainder of fiscal year through year 5 | 0 |
Executive Retirement Program | PNM |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Disbursements by employer |  | 400,000
Disbursements by employer, remainder of year | 1,300,000 |
Disbursements by employer, after current year | 4,700,000 |
Executive Retirement Program | Texas-New Mexico Power Company |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Disbursements by employer, remainder of year | 100,000 |
Executive Retirement Program | Texas-New Mexico Power Company | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Disbursements by employer | $ 0 | $ 0

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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