Derivative Instruments And Hedging Activities - Summary of Notional Amounts of Outstanding Forward Contracts Designated as a Net Investment Hedge (Detail) - Sep. 30, 2020 € in Millions, $ in Millions	USD ($)	EUR (€)
Net Investment Hedging | Designated as Hedging Instrument | Contract to sell EUR for USD
Derivative [Line Items]
Notional Amount	$ 292	€ 247