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ACCOUNTS RECEIVABLE AND OTHER FINANCIAL ASSETS - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Receivables from customers | $ 1,300 |  | $ 510
Receivables from marketing affiliates | 40 |  | 32
Provision charged to earnings | 44 | $ 206 |
Revenue |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision charged to earnings | 13 | $ 32 |
Prepaid expenses, net |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Prepayments to customers | 68 |  | 107
Other assets, net |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Prepayments to customers | $ 35 |  | $ 45

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