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BUSINESS COMBINATIONS - Schedule of PCD Loans and Leases Acquired (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 27, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |
Discount for loans fair value at acquisition date |  | $ 0 | $ 220 | $ 272
SVBB |  |  |  |
Business Acquisition [Line Items] |  |  |  |
UPB | $ 71,287 |  |  |
Fair value | 68,468 |  |  |
SVBB | PCD |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Discount for loans fair value at acquisition date | 0 |  |  |
UPB | 2,568 |  |  |
Fair value | 2,046 |  |  |
Total fair value discount | 522 |  |  |
Less: discount for loans with $0 fair value at SVBB Acquisition Date | 26 |  |  |
Less: PCD gross-up | 220 |  |  |
PCD discount | $ 276 |  |  |

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