Financial Instruments and Fair Value Measurements - Summary of Undesignated Foreign Currency Forwards Activity (Detail) - Forwards [Member] - Undesignated Derivatives [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	$ 669,000,000	$ 574,000,000	$ 457,000,000
New contracts	2,571,000,000	860,000,000	410,000,000
Matured, expired or settled contracts	(2,133,000,000)	(765,000,000)	(293,000,000)
Notional amounts at December 31	$ 1,107,000,000	$ 669,000,000	$ 574,000,000
Weighted average forward rate at December 31	0	0	0
Active contracts at December 31 | Derivative	0	0	0
CAD
Derivative [Line Items]
Notional amounts at January 1	$ 55,000,000	$ 56,000,000	$ 38,000,000
New contracts	201,000,000	28,000,000	41,000,000
Matured, expired or settled contracts	(136,000,000)	(29,000,000)	(23,000,000)
Notional amounts at December 31	$ 120,000,000	$ 55,000,000	$ 56,000,000
Weighted average forward rate at December 31	1.32	1.28	1.29
Active contracts at December 31 | Derivative	40	24	24
EUR
Derivative [Line Items]
Notional amounts at January 1	$ 314,000,000	$ 233,000,000	$ 197,000,000
New contracts	619,000,000	252,000,000	143,000,000
Matured, expired or settled contracts	(352,000,000)	(171,000,000)	(107,000,000)
Notional amounts at December 31	$ 581,000,000	$ 314,000,000	$ 233,000,000
Weighted average forward rate at December 31	1.13	1.21	1.17
Active contracts at December 31 | Derivative	53	35	29
GBP
Derivative [Line Items]
Notional amounts at January 1	$ 118,000,000	$ 132,000,000	$ 78,000,000
New contracts	1,111,000,000	55,000,000	151,000,000
Matured, expired or settled contracts	(1,051,000,000)	(69,000,000)	(97,000,000)
Notional amounts at December 31	$ 178,000,000	$ 118,000,000	$ 132,000,000
Weighted average forward rate at December 31	1.32	1.32	1.29
Active contracts at December 31 | Derivative	50	24	20
JPY
Derivative [Line Items]
Notional amounts at January 1	$ 177,000,000	$ 153,000,000	$ 144,000,000
New contracts	85,000,000	102,000,000	75,000,000
Matured, expired or settled contracts	(80,000,000)	(78,000,000)	(66,000,000)
Notional amounts at December 31	$ 182,000,000	$ 177,000,000	$ 153,000,000
Weighted average forward rate at December 31	103.39	105.17	106.25
Active contracts at December 31 | Derivative	44	34	34
SEK
Derivative [Line Items]
Notional amounts at January 1	$ 0
New contracts	31,000,000
Matured, expired or settled contracts	0
Notional amounts at December 31	$ 31,000,000	$ 0
Weighted average forward rate at December 31	9.42
Active contracts at December 31 | Derivative	20
Other
Derivative [Line Items]
Notional amounts at January 1	$ 5,000,000	0
New contracts	524,000,000	423,000,000
Matured, expired or settled contracts	(514,000,000)	(418,000,000)
Notional amounts at December 31	$ 15,000,000	$ 5,000,000	$ 0
Weighted average forward rate at December 31	0	0
Active contracts at December 31 | Derivative	0	0