RELATED PARTY TRANSACTIONS - Schedule of Transactions with Related Parties (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Related Party Transaction [Line Items]
Revenues and service charges	$ 8,893	$ 8,979
Expenses	11,362	9,016
Distributions to noncontrolling interests and redeemable noncontrolling interests	129	157
Related Party
Related Party Transaction [Line Items]
Revenues and service charges	205	214
Expenses	55	68
Distributions to noncontrolling interests and redeemable noncontrolling interests	$ 129	$ 157

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details