Financial Instruments and Fair Value Measurements - Foreign Currency Contracts Activity (Detail) - Forwards [Member] - Net Investment Hedges [Member] - Designated As Hedging Instrument [Member]	9 Months Ended
	Sep. 30, 2020 USD ($) Derivative	Sep. 30, 2019 USD ($) Derivative
Derivative [Line Items]
Notional amounts at January 1	$ 484,000,000	$ 687,000,000
New contracts	622,000,000	1,521,000,000
Matured, expired or settled contracts	(624,000,000)	(1,728,000,000)
Notional amounts at September 30	482,000,000	480,000,000
CAD
Derivative [Line Items]
Notional amounts at January 1	97,000,000	100,000,000
New contracts	298,000,000	97,000,000
Matured, expired or settled contracts	(48,000,000)	(100,000,000)
Notional amounts at September 30	$ 347,000,000	$ 97,000,000
Weighted average forward rate at September 30	1.32	1.32
Active contracts at September 30 | Derivative	6	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 September 30		$ 0
Active contracts at September 30 | Derivative		0
GBP
Derivative [Line Items]
Notional amounts at January 1	$ 387,000,000	$ 127,000,000
New contracts	324,000,000	515,000,000
Matured, expired or settled contracts	(576,000,000)	(259,000,000)
Notional amounts at September 30	$ 135,000,000	$ 383,000,000
Weighted average forward rate at September 30	1.35	1.28
Active contracts at September 30 | Derivative	1	6
EUR
Derivative [Line Items]
Notional amounts at January 1		$ 0
New contracts		420,000,000
Matured, expired or settled contracts		(420,000,000)
Notional amounts at September 30		$ 0
Active contracts at September 30 | Derivative		0