Financial Instruments and Fair Value Measurements - Summary of Undesignated Financial Instruments Exercised and Realized and Unrealized Gains (Losses) in Foreign Currency and Derivative Gains (Losses) Net (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) Contract	Dec. 31, 2018 USD ($) Contract	Dec. 31, 2017 USD ($) Contract
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Exercised contracts | Contract	115	89	44
Realized gains (losses) on the matured, expired or settled contracts	$ 28	$ (3)	$ 13
Unrealized gains (losses) on the change in fair value of outstanding contracts	$ (10)	$ 29	$ (51)