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, 2020 USD ($) Derivative	Jun. 30, 2019 USD ($) Derivative
Derivative [Line Items]
Notional amounts at January 1	$ 484,000,000	$ 687,000,000
New contracts	324,000,000	928,000,000
Matured, expired or settled contracts	(576,000,000)	(1,126,000,000)
Notional amounts at June 30	232,000,000	489,000,000
CAD
Derivative [Line Items]
Notional amounts at January 1	97,000,000	100,000,000
New contracts	0	48,000,000
Matured, expired or settled contracts	0	(50,000,000)
Notional amounts at June 30	$ 97,000,000	$ 98,000,000
Weighted average forward rate at June 30	1.32	1.30
Active contracts at June 30 | Derivative	2	2
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
Active contracts at June 30 | Derivative		0
GBP
Derivative [Line Items]
Notional amounts at January 1	$ 387,000,000	$ 127,000,000
New contracts	324,000,000	391,000,000
Matured, expired or settled contracts	(576,000,000)	(127,000,000)
Notional amounts at June 30	$ 135,000,000	$ 391,000,000
Weighted average forward rate at June 30	1.35	1.30
Active contracts at June 30 | Derivative	1	6