RESTRUCTURING AND OTHER EXIT COSTS (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) country
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit costs	$ 1	$ 34	$ 9	$ 34
Cash payments for restructuring			36
Noncash restructuring expenses and other adjustments			3
Restructuring And Related Cost Expected Cost Remaining for 2021	10		10
Restructuring And Related Cost Expected Cost Remaining for Period after 2021	4		4
Minimum
Restructuring Cost and Reserve [Line Items]
Number of countries in which the entity commenced restructuring actions | country					60
Accrued expenses and other current liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities	$ 7		$ 7		$ 37