Financial Instruments and Fair Value Measurements - Summary of Undesignated Foreign Currency Forwards Activity (Detail) - Undesignated Derivatives [Member]	12 Months Ended
	Dec. 31, 2018 USD ($) Derivative	Dec. 31, 2017 USD ($) Derivative	Dec. 31, 2016 USD ($) Derivative
BRL
Derivative [Line Items]
Notional amounts at January 1	$ 0
New contracts	324,000,000
Matured, expired or settled contracts	(319,000,000)
Notional amounts at December 31	$ 5,000,000	$ 0
Weighted average forward rate at December 31	3.74
Active contracts at December 31 | Derivative	1
CAD
Derivative [Line Items]
Notional amounts at January 1	$ 56,000,000	38,000,000
New contracts	28,000,000	41,000,000
Matured, expired or settled contracts	(29,000,000)	(23,000,000)
Notional amounts at December 31	$ 55,000,000	$ 56,000,000	$ 38,000,000
Weighted average forward rate at December 31	1.28	1.29
Active contracts at December 31 | Derivative	24	24
EUR
Derivative [Line Items]
Notional amounts at January 1	$ 233,000,000	$ 197,000,000	310,000,000
New contracts	252,000,000	143,000,000	413,000,000
Matured, expired or settled contracts	(171,000,000)	(107,000,000)	(526,000,000)
Notional amounts at December 31	$ 314,000,000	$ 233,000,000	$ 197,000,000
Weighted average forward rate at December 31	1.21	1.17	1.13
Active contracts at December 31 | Derivative	35	29	24
GBP
Derivative [Line Items]
Notional amounts at January 1	$ 132,000,000	$ 78,000,000	$ 148,000,000
New contracts	55,000,000	151,000,000	0
Matured, expired or settled contracts	(69,000,000)	(97,000,000)	(70,000,000)
Notional amounts at December 31	$ 118,000,000	$ 132,000,000	$ 78,000,000
Weighted average forward rate at December 31	1.32	1.29	1.54
Active contracts at December 31 | Derivative	24	20	8
JPY
Derivative [Line Items]
Notional amounts at January 1	$ 153,000,000	$ 144,000,000	$ 109,000,000
New contracts	102,000,000	75,000,000	146,000,000
Matured, expired or settled contracts	(78,000,000)	(66,000,000)	(111,000,000)
Notional amounts at December 31	$ 177,000,000	$ 153,000,000	$ 144,000,000
Weighted average forward rate at December 31	105.17	106.25	107.68
Active contracts at December 31 | Derivative	34	34	30
Other
Derivative [Line Items]
Notional amounts at January 1	$ 0	$ 38,000,000	$ 50,000,000
New contracts	99,000,000		15,000,000
Matured, expired or settled contracts	(99,000,000)		(27,000,000)
Notional amounts at December 31	$ 0	$ 0	$ 38,000,000
Weighted average forward rate at December 31	0		0
Active contracts at December 31 | Derivative	0		16