Financial Instruments and Fair Value Measurements - Foreign Currency Contracts Activity (Detail) - Forwards [Member] - Net Investment Hedges [Member] - Designated As Hedging Instrument [Member]	12 Months Ended
	Dec. 31, 2019 USD ($) Derivative	Dec. 31, 2018 USD ($) Derivative	Dec. 31, 2017 USD ($) Derivative
Derivative [Line Items]
Notional amounts at January 1	$ 687,000,000	$ 99,000,000	$ 146,000,000
New contracts	1,655,000,000	2,848,000,000	226,000,000
Matured, expired or settled contracts	(1,858,000,000)	(2,260,000,000)	(273,000,000)
Notional amounts at December 31	484,000,000	687,000,000	99,000,000
BRL
Derivative [Line Items]
Notional amounts at January 1	460,000,000	0
New contracts	489,000,000	1,568,000,000
Matured, expired or settled contracts	(949,000,000)	(1,108,000,000)
Notional amounts at December 31	$ 0	$ 460,000,000	0
Weighted average forward rate at December 31	0	3.91
Active contracts at December 31 | Derivative	0	1
CAD
Derivative [Line Items]
Notional amounts at January 1	$ 100,000,000	$ 99,000,000	100,000,000
New contracts	97,000,000	100,000,000	99,000,000
Matured, expired or settled contracts	(100,000,000)	(99,000,000)	(100,000,000)
Notional amounts at December 31	$ 97,000,000	$ 100,000,000	$ 99,000,000
Weighted average forward rate at December 31	1.32	1.28	1.34
Active contracts at December 31 | Derivative	2	2	2
EUR
Derivative [Line Items]
Notional amounts at January 1	$ 0	$ 0
New contracts	420,000,000	1,053,000,000
Matured, expired or settled contracts	(420,000,000)	(1,053,000,000)
Notional amounts at December 31	$ 0	$ 0	$ 0
Weighted average forward rate at December 31	0	0
Active contracts at December 31 | Derivative	0	0
GBP
Derivative [Line Items]
Notional amounts at January 1	$ 127,000,000	$ 0	46,000,000
New contracts	649,000,000	127,000,000	127,000,000
Matured, expired or settled contracts	(389,000,000)	0	(173,000,000)
Notional amounts at December 31	$ 387,000,000	$ 127,000,000	$ 0
Weighted average forward rate at December 31	1.29	1.28	0
Active contracts at December 31 | Derivative	5	2	0