REVENUE - Other Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	[1]	Sep. 30, 2020	Sep. 30, 2019	[1]	Dec. 31, 2019
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Accrued expenses and other current liabilities	$ 1,388			$ 1,388			$ 1,578
Revenues	2,640	$ 5,040		5,558	$ 11,727
Increase (decrease) in revenue for refunds paid or estimated to be payable due to the Impact of COVID-19	21			(42)
Other consumer/customer liabilities
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Accrued expenses and other current liabilities	122			122			22
Other consumer/customer liabilities | Rebates to customers meeting certain eligibility requirements
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Accrued expenses and other current liabilities	88			88
Revenues	(96)			(96)
Customer Incentive Programs | Loyalty Programs
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Decrease in liability balance primarily due to changes in estimates with a corresponding increase to revenue	28
Accrued expenses and other current liabilities | Customer Incentive Programs | Loyalty Programs
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Liabilities for loyalty program incentives	$ 28			$ 28			$ 80

[1] (1) Geographic information for the three and nine months ended September 30, 2019 has been recast to conform to the current period presentation