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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 79 $ 81
Accrued value-added tax on purchases 36 46
Deposits 33 40
Other current assets 66 84
Prepaid expenses and other current assets, net $ 214 $ 251