Derivative Instruments And Hedging Activities - Summary of Notional Amounts of Outstanding Foreign Exchange Forwards (Detail) - Not Designated as Accounting Hedges € in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions	Mar. 31, 2020 USD ($)	Mar. 31, 2020 CAD ($)	Mar. 31, 2020 SGD ($)	Mar. 31, 2020 GBP (£)	Mar. 31, 2020 EUR (€)	Mar. 31, 2020 JPY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)	Dec. 31, 2019 SGD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 JPY (¥)
Contracts to sell USD for GBP
Derivative [Line Items]
Notional Amount	$ 451			£ 379			$ 235			£ 178
Contracts to sell USD for Japanese Yen
Derivative [Line Items]
Notional Amount	29					¥ 3,200	29					¥ 3,200
Contracts to sell USD for Canadian dollars
Derivative [Line Items]
Notional Amount	94	$ 130					83	$ 110
Contracts to sell USD for Singapore dollars
Derivative [Line Items]
Notional Amount	59		$ 86				41		$ 56
Contracts to sell USD for Euros
Derivative [Line Items]
Notional Amount	$ 61				€ 55		$ 421				€ 378
Contracts to sell EUR for GBP
Derivative [Line Items]
Notional Amount				£ 0	€ 0					£ 21	€ 25