REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Accounts receivables from customers	$ 3,726	$ 3,581
Unbilled receivables	251	233
Deferred revenue liabilities, included in other current liabilities	586	$ 489
Backlog of unsatisfied or partially satisfied obligations	$ 12,300
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Disaggregation of Revenue [Line Items]
Backlog expected to be recognized in the next twelve months, percent	82.00%
Expected timing of satisfaction	12 months

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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