Derivative Instruments And Hedging Activities - Summary of Notional Amounts of Outstanding Foreign Exchange Forwards (Detail) - Not Designated as Accounting Hedges ₽ in Millions, € in Millions, ₨ in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions	Sep. 30, 2021 USD ($)	Sep. 30, 2021 EUR (€)	Sep. 30, 2021 GBP (£)	Sep. 30, 2021 JPY (¥)	Sep. 30, 2021 CAD ($)	Sep. 30, 2021 SGD ($)	Sep. 30, 2021 RUB (₽)	Sep. 30, 2021 INR (₨)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 GBP (£)	Dec. 31, 2020 JPY (¥)	Dec. 31, 2020 CAD ($)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 RUB (₽)	Dec. 31, 2020 INR (₨)
Contracts to sell USD for GBP
Derivative [Line Items]
Notional Amount	$ 190		£ 138						$ 295		£ 222
Contracts to sell USD for Japanese yen
Derivative [Line Items]
Notional Amount	18			¥ 2,000					15			¥ 1,600
Contracts to sell USD for Canadian dollars
Derivative [Line Items]
Notional Amount	120				$ 150				107				$ 140
Contracts to sell USD for Singapore dollars
Derivative [Line Items]
Notional Amount	66					$ 90			59					$ 79
Contracts to sell USD for euros
Derivative [Line Items]
Notional Amount	282	€ 240							447	€ 376
Contracts to sell Euros for GBP
Derivative [Line Items]
Notional Amount		€ 0	£ 0							€ 135	£ 121
Contracts to sell USD for Russian ruble
Derivative [Line Items]
Notional Amount	13						₽ 1,000		13						₽ 1,000
Contracts to sell USD for Indian rupee
Derivative [Line Items]
Notional Amount	$ 18							₨ 1,350	$ 18							₨ 1,350