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Pension and Other Postretirement Benefit Plans - Weighted Average Actuarial Assumptions Used (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States | Pension
Weighted average actuarial assumptions used in determining the benefit obligations
Discount rate	3.60%	4.10%
Weighted average actuarial assumptions used in determining the net periodic benefit cost
Discount rate	4.10%	4.40%	4.10%
Expected return on plan assets	7.30%	7.50%	7.80%
United States | Other Postretirement
Weighted average actuarial assumptions used in determining the benefit obligations
Discount rate	3.50%	3.90%
Weighted average actuarial assumptions used in determining the net periodic benefit cost
Discount rate	3.90%	4.20%	3.90%
Foreign | Pension
Weighted average actuarial assumptions used in determining the benefit obligations
Discount rate	3.10%	3.30%
Rate of compensation increase	3.30%	3.30%
Weighted average actuarial assumptions used in determining the net periodic benefit cost
Discount rate	3.30%	3.80%	3.60%
Expected return on plan assets	6.30%	6.30%	6.50%
Rate of compensation increase	3.30%	3.30%	3.10%
Foreign | Other Postretirement
Weighted average actuarial assumptions used in determining the benefit obligations
Discount rate	3.50%	3.90%
Weighted average actuarial assumptions used in determining the net periodic benefit cost
Discount rate	3.90%	4.20%	4.00%

X

- 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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X

- 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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X

- 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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- Definition

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

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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