Financial Instruments and Fair Value Measurements - Summary of Activity in Interest Rate Swaps (Detail) - Interest Rate Swaps [Member] - Cash Flow Hedges [Member] - Designated As Hedging Instrument [Member] - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
EUR
Derivative [Line Items]
Notional amounts at January 1	$ 0	$ 500,000,000
New contracts	165,000,000	0
Matured, expired or settled contracts	0	0
Notional amounts at June 30	165,000,000	$ 500,000,000
USD
Derivative [Line Items]
Notional amounts at January 1	0
New contracts	1,000,000,000
Matured, expired or settled contracts	(750,000,000)
Notional amounts at June 30	$ 250,000,000