Financial Instruments and Fair Value Measurements - Foreign Currency Contracts Activity (Detail) - Forwards [Member] - Net Investment Hedges [Member] - Designated As Hedging Instrument [Member]	3 Months Ended
	Mar. 31, 2019 USD ($) Derivative	Mar. 31, 2018 USD ($) Derivative
BRL
Derivative [Line Items]
Notional amounts at January 1	$ 460,000,000
New contracts	489,000,000
Matured, expired or settled contracts	(949,000,000)
Notional amounts at March 31	$ 0
Weighted average forward rate at March 31	0
Active contracts at March 31 | Derivative	0
GBP
Derivative [Line Items]
Notional amounts at January 1	$ 127,000,000
New contracts	262,000,000
Matured, expired or settled contracts	0
Notional amounts at March 31	$ 389,000,000
Weighted average forward rate at March 31	1.30
Active contracts at March 31 | Derivative	6
CAD
Derivative [Line Items]
Notional amounts at January 1	$ 100,000,000	$ 99,000,000
New contracts	0	100,000,000
Matured, expired or settled contracts	0	(99,000,000)
Notional amounts at March 31	$ 100,000,000	$ 100,000,000
Weighted average forward rate at March 31	1.28	1.28
Active contracts at March 31 | Derivative	2	2