SUPPLEMENTAL FINANCIAL INFORMATION - Interest Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest Income Expense Net
Interest expense, net of capitalized interest	$ 54	$ 42	$ 128	$ 112
Interest income	(4)	(3)	(10)	(16)
Interest expense, net	$ 50	$ 39	$ 118	$ 96