Derivatives and Hedging Activities - Narrative (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Designated as hedging instruments: | Cross Currency Interest Rate Contract
Derivative [Line Items]
Derivative, notional amount	$ 4,000,000,000	$ 3,300,000,000
Not designated as hedging instruments | Foreign currency forward contracts
Derivative [Line Items]
Derivative, notional amount	3,400,000,000	3,400,000,000
Net investment hedges | Designated as hedging instruments:
Derivative [Line Items]
Derivative, notional amount	1,500,000,000	1,900,000,000
Net investment hedges | Designated as hedging instruments: | Foreign Exchange Forward
Derivative [Line Items]
Derivative, notional amount	375,700,000	355,600,000
Cash flow hedges | Foreign currency forward and option contracts
Derivative [Line Items]
Derivative, notional amount	898,500,000	912,900,000
Net gain (loss) to be reclassified within the next 12 months, Foreign Currency Cash Flow Hedge	1,600,000	(35,400,000)
Cash flow hedges | Interest rate locks
Derivative [Line Items]
Derivative, notional amount	350,000,000	0
Derivative, notional aggregate amount settled	1,300,000,000
Net loss to be reclassified within the next 12 months, Interest Rate Cash Flow Hedge	$ 4,200,000	$ 4,100,000