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BORROWINGS - Schedule of Long-term Borrowings (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |
Capital lease obligations | $ 15 | $ 8 |
Total long-term borrowings | 36,684 | 37,169 |
Loss (gain) on extinguishment of debt | 2 | 0 | $ (7)
Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt | $ 2 |  |
Parent | Fixed-to-Floating subordinated notes at 3.375% | Subordinated Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 3.375% |  |
Long-term debt, gross | $ 350 | 349 |
Parent | Junior subordinated debentures (FCB/SC Capital Trust II) | Subordinated Debt |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 0 | 18 |
Subsidiaries | Senior unsecured fixed-to-floating rate notes at 2.969% | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 2.969% |  |
Long-term debt, gross | $ 0 | 318 |
Callable feature term | 1 year |  |
Subsidiaries | Fixed senior unsecured notes at 6.00% | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 6.00% |  |
Long-term debt, gross | $ 58 | 59 |
Subsidiaries | Fixed subordinated notes at 6.125% | Subordinated Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 6.125% |  |
Long-term debt, gross | $ 445 | 460 |
Subsidiaries | Fixed-to-Fixed subordinated notes at 4.125% | Subordinated Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 4.125% |  |
Long-term debt, gross | $ 0 | 101 |
Callable feature term | 5 years |  |
Subsidiaries | Junior subordinated debentures (SCB Capital Trust I) | Subordinated Debt |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 0 | 10 |
Subsidiaries | Purchase Money Note to FDIC fixed at 3.50% | Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 3.50% |  |
Long-term debt, gross | $ 35,816 | $ 35,846 |

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