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Weighted-Average Assumptions Used in Determining (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension benefits | United States And Puerto Rico Nonqualified Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.62%	4.09%
Rate of compensation increase	3.65%	3.75%
Discount rate	4.09%	4.36%	4.00%
Expected return on plan assets	6.50%	7.00%	7.25%
Rate of compensation increase	3.75%	3.75%	3.76%
Pension benefits | International Unfunded Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.02%	2.05%
Rate of compensation increase	3.05%	3.08%
Discount rate	2.03%	2.60%	2.26%
Expected return on plan assets	5.77%	6.07%	6.20%
Rate of compensation increase	3.11%	3.37%	3.33%
OPEB
Defined Benefit Plan Disclosure [Line Items]
Annual rate of increase in the per-capita cost	6.25%	6.25%
Rate decreased to	5.00%	5.00%
by the year ended	2023	2022
Annual rate of increase in the per-capita cost	6.25%	6.50%	6.00%
Rate decreased to	5.00%	5.00%	5.00%
by the year ended	2023	2022	2019
OPEB | United States And Puerto Rico Nonqualified Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.51%	3.89%
Discount rate	3.89%	4.12%	3.95%

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- Definition

Defined benefit plan assumptions used calculating benefit obligation annual rate decrease in per capita cost.

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Defined benefit plan assumptions used calculating benefit obligation annual rate decrease in per capita cost by the year ended.

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- Definition

Defined benefit plan assumptions used calculating benefit obligation annual rate of per capita cost increase.

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- Definition

Defined benefit plan assumptions used calculating net periodic benefit cost annual rate decrease in per capita cost.

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- Definition

Defined benefit plan assumptions used calculating net periodic benefit cost annual rate of decrease in per capita cost by the year ended.

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- Definition

Defined benefit plan assumptions used calculating net periodic benefit cost annual rate of increase in per capita cost.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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