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Employee benefits - Funded Status of the plan (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Funded status of the plan: |  |  |
Fair value of plan assets at end of year | $ 860,484 | $ 878,785 |
Pension Plans |  |  |
Funded status of the plan: |  |  |
Benefit obligation at end of year | (851,471) | (914,353) | $ (852,551)
Fair value of plan assets at end of year | 860,484 | 878,785 | 799,935
Funded status at year end | 9,013 | (35,568) | (52,616)
OPEB Plan |  |  |
Funded status of the plan: |  |  |
Benefit obligation at end of year | (159,958) | (179,210) | (168,681)
Fair value of plan assets at end of year | 0 | 0 | 0
Funded status at year end | $ (159,958) | $ (179,210) | $ (168,681)

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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