RELATED PARTY TRANSACTIONS - Schedule of Transactions with Related Parties (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Related Party Transaction [Line Items]
Revenues and service charges	$ 8,717	$ 9,812	$ 17,610	$ 18,791
Expenses	8,480	9,997	19,842	19,013
Distributions to noncontrolling interests and redeemable noncontrolling interests			144	174
Related Party
Related Party Transaction [Line Items]
Revenues and service charges	177	161	382	375
Expenses	48	84	103	152
Distributions to noncontrolling interests and redeemable noncontrolling interests	$ 15	$ 17	$ 144	$ 174

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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- 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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