Derivative Instruments And Hedging Activities - Schedule of Notional Amount of Net Investment Hedges (Detail) - Designated as Hedging Instrument - Cross-currency swap € in Millions	Sep. 30, 2021 EUR (€)
Net Investment Hedging
Derivative [Line Items]
Notional Amount	€ 2,526
2022
Derivative [Line Items]
Notional Amount	438
2023
Derivative [Line Items]
Notional Amount	442
2024
Derivative [Line Items]
Notional Amount	443
2026
Derivative [Line Items]
Notional Amount	450
2027
Derivative [Line Items]
Notional Amount	246
2028
Derivative [Line Items]
Notional Amount	€ 507