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ACQUISITIONS - Schedule of Acquisition and Integration Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |
Provision for credit losses | $ 724 | $ 394 | $ (360)
Salaries and employee benefits | 2,599 | 2,549 | 2,132
Outside services | 687 | 700 | 595
Other operating expense | 973 | 585 | 411
Income before income tax expense | 2,030 | $ 2,655 | $ 2,977
Investors Acquisition | Acquisition-related Costs |  |  |
Business Acquisition [Line Items] |  |  |
Provision for credit losses | 145 |  |
Salaries and employee benefits | 83 |  |
Outside services | 61 |  |
Mark-to-market losses on LHFS portfolio | 31 |  |
Other operating expense | 15 |  |
Income before income tax expense | $ 335 |  |

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