ACCOUNTS RECEIVABLE AND OTHER FINANCIAL ASSETS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from customers, gross, current	$ 1,100	$ 510
Receivables from third-party payment processors, gross, current	310	159
Accounts receivable, credit loss expense	48	216	$ 69
Prepaid expenses, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Prepayments to certain customers	67	107
Other assets, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Prepayments to certain customers	18	45
Revenue
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, credit loss expense	$ 13	$ 37