Financial Instruments and Fair Value Measurements - Summary of Undesignated Foreign Currency Forwards Activity (Detail) - Forwards [Member] - Undesignated Derivatives [Member]	6 Months Ended
	Jun. 30, 2021 USD ($) Derivative	Jun. 30, 2020 USD ($) Derivative
Derivative [Line Items]
Notional amounts at January 1	$ 1,162,000,000	$ 1,107,000,000
New contracts	594,000,000	1,207,000,000
Matured, expired or settled contracts	(262,000,000)	(1,461,000,000)
Notional amounts at June 30	1,494,000,000	$ 853,000,000
Weighted average forward rate at June 30		0
Active contracts at June 30 | Derivative		0
CAD
Derivative [Line Items]
Notional amounts at January 1	163,000,000	$ 120,000,000
New contracts	173,000,000	16,000,000
Matured, expired or settled contracts	(61,000,000)	(22,000,000)
Notional amounts at June 30	$ 275,000,000	$ 114,000,000
Weighted average forward rate at June 30	1.27	1.33
Active contracts at June 30 | Derivative	67	42
EUR
Derivative [Line Items]
Notional amounts at January 1	$ 474,000,000	$ 581,000,000
New contracts	228,000,000	809,000,000
Matured, expired or settled contracts	(78,000,000)	(1,071,000,000)
Notional amounts at June 30	$ 624,000,000	$ 319,000,000
Weighted average forward rate at June 30	1.23	1.16
Active contracts at June 30 | Derivative	81	48
GBP
Derivative [Line Items]
Notional amounts at January 1	$ 207,000,000	$ 178,000,000
New contracts	110,000,000	294,000,000
Matured, expired or settled contracts	(69,000,000)	(285,000,000)
Notional amounts at June 30	$ 248,000,000	$ 187,000,000
Weighted average forward rate at June 30	1.36	1.31
Active contracts at June 30 | Derivative	63	54
JPY
Derivative [Line Items]
Notional amounts at January 1	$ 252,000,000	$ 182,000,000
New contracts	62,000,000	60,000,000
Matured, expired or settled contracts	(38,000,000)	(50,000,000)
Notional amounts at June 30	$ 276,000,000	$ 192,000,000
Weighted average forward rate at June 30	102.99	102.86
Active contracts at June 30 | Derivative	72	45
SEK
Derivative [Line Items]
Notional amounts at January 1	$ 38,000,000	$ 31,000,000
New contracts	12,000,000	9,000,000
Matured, expired or settled contracts	(7,000,000)	(6,000,000)
Notional amounts at June 30	$ 43,000,000	$ 34,000,000
Weighted average forward rate at June 30	8.54	9.40
Active contracts at June 30 | Derivative	63	30
Other
Derivative [Line Items]
Notional amounts at January 1	$ 28,000,000	$ 15,000,000
New contracts	9,000,000	19,000,000
Matured, expired or settled contracts	(9,000,000)	(27,000,000)
Notional amounts at June 30	$ 28,000,000	$ 7,000,000
Weighted average forward rate at June 30		0
Active contracts at June 30 | Derivative		0