Supplemental Financial Information - Interest Expense, Net (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest Income Expense Net
Interest expense, net of capitalized interest	$ 28	$ 24	$ 81	$ 70
Interest income	(15)	(13)	(30)	(36)
Interest expense, net	$ 13	$ 11	$ 51	$ 34