Schedule of Changes in Level 3 Plan Assets (Detail) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	$ 602	$ 924
Net Realized and Unrealized Gains/ (Losses)	11	27
Net Purchases, Issuances and Settlements	166	(210)
Net Transfers Into/(Out of) Level 3	(25)	(6)
Currency Impact	62	(133)
Fair value of plan assets at December 31	816	602
Non-U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	3	0
Net Realized and Unrealized Gains/ (Losses)	0	0
Net Purchases, Issuances and Settlements	0	0
Net Transfers Into/(Out of) Level 3	(3)	3
Currency Impact	0	0
Fair value of plan assets at December 31	0	3
Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	35	26
Net Realized and Unrealized Gains/ (Losses)	0	6
Net Purchases, Issuances and Settlements	(16)	15
Net Transfers Into/(Out of) Level 3	(21)	(7)
Currency Impact	2	(5)
Fair value of plan assets at December 31	0	35
Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	538	665
Net Realized and Unrealized Gains/ (Losses)	10	21
Net Purchases, Issuances and Settlements	182	(41)
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	60	(107)
Fair value of plan assets at December 31	790	538
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	22	230
Net Realized and Unrealized Gains/ (Losses)	1	0
Net Purchases, Issuances and Settlements	0	(184)
Net Transfers Into/(Out of) Level 3	0	(3)
Currency Impact	0	(21)
Fair value of plan assets at December 31	23	22
Private Equity and Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	4	3
Net Realized and Unrealized Gains/ (Losses)	0	0
Net Purchases, Issuances and Settlements	0	0
Net Transfers Into/(Out of) Level 3	(1)	1
Currency Impact	0	0
Fair value of plan assets at December 31	$ 3	$ 4

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets 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 (b)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements.

+ 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 (d)(5)(iv)(02)(B)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.

+ 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 (d)(5)(iv)(02)(C)
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