FUNDS RECEIVABLE AND CUSTOMER ACCOUNTS AND INVESTMENTS - Summary of Cumulative Gross Unrealized Gains and Cumulative Gross Unrealized Losses and Impairment Related to Non-marketable Equity Securities Accounted for Under the Measurement Alternative (Details) - USD ($) $ in Millions |
Sep. 30, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Investments, Debt and Equity Securities [Abstract] | ||
| Cumulative gross unrealized gains | $ 1,137 | $ 733 |
| Cumulative gross unrealized losses and impairments | $ (27) | $ (27) |