REVENUE - Other (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Reduction in revenue for refunds paid or estimated to be payable	$ 63
Accrued Liabilities [Member] | Customer Incentive Programs [Member] | Loyalty Programs [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract liabilities, current	67	$ 80
Accrued Liabilities [Member] | Customer Incentive Programs [Member] | Other customer incentive programs [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract liabilities, current	$ 30	$ 22