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ACQUISITIONS - Schedule of Acquisition and Integration Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |
Provision for credit losses | $ 394 | $ (360) | $ 1,431
Salaries and employee benefits | 2,549 | 2,132 | 2,123
Outside services | 700 | 595 | 553
Other operating expense | 585 | 411 | 419
Total acquisition-related costs | 2,655 | $ 2,977 | $ 1,298
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 |  |
Total acquisition-related costs | $ 335 |  |

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