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BORROWINGS - Schedule of Long-term Borrowings (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |
Capital lease obligations | $ 8 |  | $ 8 |  | $ 9
Unamortized purchase accounting adjustments | (143) |  | (143) |  | (163)
Total long-term borrowings | 37,072 |  | 37,072 |  | 37,169
Loss on extinguishment of debt | $ 0 | $ 0 | 2 | $ 0 |
Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loss 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% |  | 3.375% |  |
Long-term debt, gross | $ 350 |  | $ 350 |  | 350
Parent | Junior subordinated debentures (FCB/SC Capital Trust II) | Subordinated Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 0 |  | $ 0 |  | 20
Subsidiaries | Senior unsecured fixed-to-floating rate notes at 2.969% | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, stated interest rate | 2.969% |  | 2.969% |  |
Long-term debt, gross | $ 315 |  | $ 315 |  | 316
Subsidiaries | Fixed senior unsecured notes at 6.00% | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, stated interest rate | 6.00% |  | 6.00% |  |
Long-term debt, gross | $ 51 |  | $ 51 |  | 51
Subsidiaries | Fixed subordinated notes at 6.125% | Subordinated Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, stated interest rate | 6.125% |  | 6.125% |  |
Long-term debt, gross | $ 400 |  | $ 400 |  | 404
Subsidiaries | Fixed-to-Fixed subordinated notes at 4.125% | Subordinated Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, stated interest rate | 4.125% |  | 4.125% |  |
Long-term debt, gross | $ 100 |  | $ 100 |  | 100
Subsidiaries | Junior subordinated debentures (SCB Capital Trust I) | Subordinated Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 0 |  | $ 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% |  | 3.50% |  |
Long-term debt, gross | $ 35,991 |  | $ 35,991 |  | $ 36,072

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