Supplemental Financial Information - Interest Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest Income Expense Net
Interest expense, net of capitalized interest	$ 42	$ 28	$ 112	$ 81
Interest income	(3)	(15)	(16)	(30)
Interest expense, net	$ 39	$ 13	$ 96	$ 51