Summary of Activity in Reserves related to Business Optimization Initiatives (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Charges	$ 70	$ 285	$ 130
Severance and Other Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Reserve, beginning balance	164	116	127
Charges	83	221	120
Reserve adjustments	(19)	(14)	(32)
Utilization	(143)	(164)	(89)
Currency translation	27	5	(10)
Reserve, ending balance	$ 112	$ 164	$ 116

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

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