RELATED PARTY TRANSACTIONS - Schedule of Amounts Included in Condensed Consolidated Statements of Operations Related to Fee for Service Arrangement (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Related Party Transaction [Line Items]
Equity in earnings from unconsolidated affiliates	$ 1	$ 6	$ 8	$ 17
Commissions and other fees	1,961	1,300	4,604	3,714
Related Party
Related Party Transaction [Line Items]
Equity in earnings from unconsolidated affiliates	1	6	8	17
Commissions and other fees	$ 1	$ 44	$ 51	$ 122

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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 of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details