Schedule of Changes in Balance Sheet Position of Employee Related Restructuring Reserves (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Reserve at end of the period	$ 107		$ 107
Restructuring employee-related
Restructuring Cost and Reserve [Line Items]
Reserve at beginning of the period	113	$ 52	126	$ 56
Provision - charge	1	69	2	71
Provision - reversal	0	(7)	0	(7)
Cash payments	(8)	(16)	(17)	(20)
Translation difference	1	2	(4)	0
Reserve at end of the period	$ 107	$ 100	$ 107	$ 100

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.

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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.

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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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