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Pension and Other Benefit Plans - Weighted-Average Allocation of Plan Assets and Target Allocation by Asset Category (Detail) | Dec. 31, 2020 | Dec. 31, 2019
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US |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets | 100.00% | 100.00%
Target allocation of assets | 100.00% | 100.00%
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets | 100.00% | 100.00%
Target allocation of assets | 100.00% | 100.00%
Equity securities | US |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation of assets | 15.00% | 22.00%
Equity securities | US | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets | 20.00% |
Equity securities | US | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets | 30.00% |
Equity securities | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation of assets | 43.00% | 50.00%
Equity securities | International | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets |  | 47.00%
Equity securities | International | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets |  | 59.00%
Debt securities | US |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation of assets | 76.00% | 70.00%
Debt securities | US | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets | 63.00% |
Debt securities | US | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets | 77.00% |
Debt securities | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation of assets | 36.00% | 31.00%
Debt securities | International | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets |  | 27.00%
Debt securities | International | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets |  | 33.00%
Cash and cash equivalents | US |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation of assets | 3.00% | 2.00%
Cash and cash equivalents | US | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets | 0.00% |
Cash and cash equivalents | US | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets | 3.00% |
Cash and cash equivalents | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation of assets | 4.00% | 4.00%
Cash and cash equivalents | International | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets |  | 0.00%
Cash and cash equivalents | International | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets |  | 3.00%
Alternative investments | US |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation of assets | 6.00% | 6.00%
Alternative investments | US | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets | 5.00% |
Alternative investments | US | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets | 10.00% |
Alternative investments | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation of assets | 17.00% | 15.00%
Alternative investments | International | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets |  | 15.00%
Alternative investments | International | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Percentage of Assets |  | 22.00%

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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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- 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 -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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