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Pension and Other Benefit Plans - Additional Information (Detail) - Postretirement medical plan | Dec. 31, 2023
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Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Investment of assets in government and government-related debt securities under US postretirement medical plan | 87.00%
Government and related debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Investment of assets in government and government-related debt securities under US postretirement medical plan | 13.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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