REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Contract assets	$ 22	$ 16
Contract liabilities - Current	16	22
Customer return assets	8	8
Customer incentive payments	43	43
Customer incentive payments	$ 148	166
Minimum
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction (in years)	3 years
Maximum
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction (in years)	7 years
Other Current Liabilities
Disaggregation of Revenue [Line Items]
Contract liabilities - Current	$ 16	22
Other non-current liabilities
Disaggregation of Revenue [Line Items]
Deferred income	1	6
Prepayments and other current assets
Disaggregation of Revenue [Line Items]
Customer incentive payments	43	43
Other non-current assets
Disaggregation of Revenue [Line Items]
Customer incentive payments	$ 148	$ 166