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ACQUISITIONS - Schedule of Acquisition and Integration Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Business Acquisition [Line Items] |  |  |  |
Provision for credit losses | $ 90 | $ (48) | $ 303 | $ (308)
Salaries and employee benefits | 639 | 509 | 1,916 | 1,581
Outside services | 172 | 144 | 530 | 420
Other operating expense | 165 | 124 | 428 | 308
Total acquisition-related costs | 813 | $ 681 | 1,827 | $ 2,293
Investors Acquisition | Acquisition-related Costs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Provision for credit losses | 0 |  | 145 |
Salaries and employee benefits | 12 |  | 73 |
Outside services | 12 |  | 48 |
Mark-to-market losses on LHFS portfolio | 0 |  | 31 |
Other operating expense | 8 |  | 10 |
Total acquisition-related costs | $ 32 |  | $ 307 |

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