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Pension and Other Benefit Plans - Weighted-Average Allocation of Plan Assets and Target Allocation by Asset Category (Detail)	Dec. 31, 2019	Dec. 31, 2018
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	22.00%	21.00%
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	50.00%	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	70.00%	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	31.00%	32.00%
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	2.00%	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%	2.00%
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%	7.00%
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	15.00%	16.00%
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%

X

- Definition

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+ References

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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

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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

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