Financial Instruments and Fair Value Measurements - Foreign Currency Contracts Activity (Detail) - Forwards [Member] - Net Investment Hedges [Member] - Designated As Hedging Instrument [Member]	6 Months Ended
	Jun. 30, 2019 USD ($) Derivative	Jun. 30, 2018 USD ($) 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 June 30	$ 0
Weighted average forward rate at June 30	0
Active contracts at June 30 | Derivative	0
GBP
Derivative [Line Items]
Notional amounts at January 1	$ 127,000,000
New contracts	391,000,000
Matured, expired or settled contracts	(127,000,000)
Notional amounts at June 30	$ 391,000,000
Weighted average forward rate at June 30	1.30
Active contracts at June 30 | Derivative	6
CAD
Derivative [Line Items]
Notional amounts at January 1	$ 100,000,000	$ 99,000,000
New contracts	48,000,000	100,000,000
Matured, expired or settled contracts	(50,000,000)	(99,000,000)
Notional amounts at June 30	$ 98,000,000	$ 100,000,000
Weighted average forward rate at June 30	1.30	1.28
Active contracts at June 30 | Derivative	2	2
EUR
Derivative [Line Items]
Notional amounts at January 1		$ 0
New contracts		35,000,000
Matured, expired or settled contracts		0
Notional amounts at June 30		$ 35,000,000
Weighted average forward rate at June 30		1.16
Active contracts at June 30 | Derivative		1