Restructuring - Summary of Amounts Recorded for Restructuring Plans (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring reserves, beginning balance	$ 74
Expense, net of reversals	45
Payments	(55)
Foreign currency translation and other	(11)
Restructuring reserves, ending balance	53
Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserves, beginning balance	47
Expense, net of reversals	45
Payments	(40)
Foreign currency translation and other	(2)
Restructuring reserves, ending balance	50
Facility Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserves, beginning balance	27
Payments	(15)
Foreign currency translation and other	(9)
Restructuring reserves, ending balance	$ 3