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FAIR VALUE MEASUREMENTS - Residential Mortgage and Commercial Real Estate Loans Held For Sale (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | $ 1,334 | $ 858
Level 2 | Residential mortgage loans held for sale |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | 592 | 633
Aggregate Unpaid Principal | 573 | 625
Aggregate Fair Value Greater (Less) Than Aggregate Unpaid Principal | 19 | 8
Level 2 | Commercial loans held for sale |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | 176 | 192
Aggregate Unpaid Principal | 186 | 199
Aggregate Fair Value Greater (Less) Than Aggregate Unpaid Principal | $ (10) | $ (7)

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