Derivatives and Hedging Activities - Narrative (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Designated as hedging instruments: | Cross Currency Interest Rate Contract
Derivative [Line Items]
Derivative, notional amount	$ 3,300,000,000	$ 750,000,000.0
Not designated as hedging instruments | Foreign currency forward contracts
Derivative [Line Items]
Derivative, notional amount	4,600,000,000	2,500,000,000
Net investment hedges | Designated as hedging instruments:
Derivative [Line Items]
Derivative, notional amount	1,800,000,000	4,100,000,000
Net investment hedges | Designated as hedging instruments: | Foreign Exchange Forward
Derivative [Line Items]
Derivative, notional amount	355,600,000	0
Cash flow hedges | Foreign currency forward and option contracts
Derivative [Line Items]
Derivative, notional amount	949,200,000	824,800,000
Net loss to be reclassified within the next 12 months	(7,800,000)	(16,300,000)
Cash flow hedges | Interest rate locks
Derivative [Line Items]
Derivative, notional amount	644,800,000	$ 0
Net loss to be reclassified within the next 12 months	3,600,000
Derivative, notional aggregate amount settled	$ 1,250,000,000