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Benefit Plans - Target Allocation of Assets and Acceptable Ranges (Detail) - Pension | Dec. 31, 2020
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Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 100.00%
Domestic equities |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 37.00%
Domestic equities | Minimum |
Defined Benefit Plan Disclosure [Line Items] |
Allowable range of assets | 30.00%
Domestic equities | Maximum |
Defined Benefit Plan Disclosure [Line Items] |
Allowable range of assets | 41.00%
Foreign equities |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 11.00%
Foreign equities | Minimum |
Defined Benefit Plan Disclosure [Line Items] |
Allowable range of assets | 5.00%
Foreign equities | Maximum |
Defined Benefit Plan Disclosure [Line Items] |
Allowable range of assets | 13.00%
Fixed income |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 50.00%
Fixed income | Minimum |
Defined Benefit Plan Disclosure [Line Items] |
Allowable range of assets | 40.00%
Fixed income | Maximum |
Defined Benefit Plan Disclosure [Line Items] |
Allowable range of assets | 65.00%
Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 2.00%
Real estate | Minimum |
Defined Benefit Plan Disclosure [Line Items] |
Allowable range of assets | 0.00%
Real estate | Maximum |
Defined Benefit Plan Disclosure [Line Items] |
Allowable range of assets | 4.00%
Cash |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 0.00%
Allowable range of assets | 0.00%

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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 target 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/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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