Financial Instruments and Fair Value Measurements - Summary of Undesignated Foreign Currency Forwards Activity (Detail)	3 Months Ended
	Mar. 31, 2021 USD ($) Derivative	Mar. 31, 2020 USD ($) Derivative
Derivative [Line Items]
Notional amounts at March 31		$ 750,000,000.0
Forwards [Member] | Undesignated Derivatives [Member]
Derivative [Line Items]
Notional amounts at January 1	$ 1,162,000,000	1,107,000,000
New contracts	127,000,000	1,191,000,000
Matured, expired or settled contracts	(91,000,000)	(1,322,000,000)
Notional amounts at March 31	1,198,000,000	$ 976,000,000
Weighted average forward rate at March 31		0
Active contracts at March 31 | Derivative		0
Forwards [Member] | Undesignated Derivatives [Member] | CAD
Derivative [Line Items]
Notional amounts at January 1	163,000,000	$ 120,000,000
New contracts	3,000,000	0
Matured, expired or settled contracts	(11,000,000)	(11,000,000)
Notional amounts at March 31	$ 155,000,000	$ 109,000,000
Weighted average forward rate at March 31	1.32	1.32
Active contracts at March 31 | Derivative	58	35
Forwards [Member] | Undesignated Derivatives [Member] | EUR
Derivative [Line Items]
Notional amounts at January 1	$ 474,000,000	$ 581,000,000
New contracts	83,000,000	809,000,000
Matured, expired or settled contracts	(36,000,000)	(1,003,000,000)
Notional amounts at March 31	$ 521,000,000	$ 387,000,000
Weighted average forward rate at March 31	1.23	1.16
Active contracts at March 31 | Derivative	74	61
Forwards [Member] | Undesignated Derivatives [Member] | GBP
Derivative [Line Items]
Notional amounts at January 1	$ 207,000,000	$ 178,000,000
New contracts	11,000,000	294,000,000
Matured, expired or settled contracts	(16,000,000)	(267,000,000)
Notional amounts at March 31	$ 202,000,000	$ 205,000,000
Weighted average forward rate at March 31	1.33	1.77
Active contracts at March 31 | Derivative	53	64
Forwards [Member] | Undesignated Derivatives [Member] | JPY
Derivative [Line Items]
Notional amounts at January 1	$ 252,000,000	$ 182,000,000
New contracts	25,000,000	60,000,000
Matured, expired or settled contracts	(20,000,000)	(15,000,000)
Notional amounts at March 31	$ 257,000,000	$ 227,000,000
Weighted average forward rate at March 31	102.66	103.08
Active contracts at March 31 | Derivative	68	53
Forwards [Member] | Undesignated Derivatives [Member] | SEK
Derivative [Line Items]
Notional amounts at January 1	$ 38,000,000	$ 31,000,000
New contracts	5,000,000	9,000,000
Matured, expired or settled contracts	(4,000,000)	(3,000,000)
Notional amounts at March 31	$ 39,000,000	$ 37,000,000
Weighted average forward rate at March 31	8.59	9.41
Active contracts at March 31 | Derivative	51	32
Forwards [Member] | Undesignated Derivatives [Member] | Other
Derivative [Line Items]
Notional amounts at January 1	$ 28,000,000	$ 15,000,000
New contracts	0	19,000,000
Matured, expired or settled contracts	(4,000,000)	(23,000,000)
Notional amounts at March 31	$ 24,000,000	$ 11,000,000
Weighted average forward rate at March 31		0
Active contracts at March 31 | Derivative		0