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REVENUE - Loyalty and Other Incentive Programs (Details) - Accrued expenses and other current liabilities - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Loyalty Programs |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Liabilities for loyalty and other incentive program incentives | $ 13 | $ 21
Other Incentive Programs |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Liabilities for loyalty and other incentive program incentives | $ 61 | $ 60

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