Financial Instruments and Fair Value Measurements - Foreign Currency Contracts 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] | Net Investment Hedges [Member] | Designated As Hedging Instrument [Member]
Derivative [Line Items]
Notional amounts at January 1	$ 512,000,000	484,000,000
New contracts	550,000,000	324,000,000
Matured, expired or settled contracts	(63,000,000)	(576,000,000)
Notional amounts at March 31	999,000,000	232,000,000
Forwards [Member] | CAD | Net Investment Hedges [Member] | Designated As Hedging Instrument [Member]
Derivative [Line Items]
Notional amounts at January 1	377,000,000	97,000,000
New contracts	250,000,000	0
Matured, expired or settled contracts	(63,000,000)	0
Notional amounts at March 31	$ 564,000,000	$ 97,000,000
Weighted average forward rate at March 31	1.29	1.32
Active contracts at March 31 | Derivative	7	2
Forwards [Member] | GBP | Net Investment Hedges [Member] | Designated As Hedging Instrument [Member]
Derivative [Line Items]
Notional amounts at January 1	$ 135,000,000	$ 387,000,000
New contracts	300,000,000	324,000,000
Matured, expired or settled contracts	0	(576,000,000)
Notional amounts at March 31	$ 435,000,000	$ 135,000,000
Weighted average forward rate at March 31	1.38	1.35
Active contracts at March 31 | Derivative	4	1