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RESTRUCTURING - Schedule of Restructuring Reserve Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | [1] | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning of period | $ 11 |  | $ 20 | $ 42 |  | $ 42 |  | $ 712 |  | $ 712 | $ 0
Restructuring charges | 0 |  | 0 | 1 |  |  |  |  |  | 408 | 781
Change in estimate | (5) |  | (2) | (4) |  |  |  |  |  | (149) | 0
Net restructuring charges | (5) | [1] | (2) | (3) | $ 9 | (10) | [1] | 270 | [1] | 259 | 781
Payments and utilization | (2) |  | (8) | (13) |  |  |  |  |  | (936) | (69)
Foreign exchange | 0 |  | 1 | (6) |  |  |  |  |  | 7 | 0
End of period | 4 |  | 11 | 20 |  | 4 |  |  |  | 42 | 712
Personnel costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning of period | 11 |  | 20 | 42 |  | 42 |  | 687 |  | 687 | 0
Restructuring charges | 0 |  | 0 | 1 |  |  |  |  |  | 354 | 687
Change in estimate | (5) |  | (2) | (4) |  |  |  |  |  | (146) | 0
Net restructuring charges | (5) |  | (2) | (3) |  |  |  |  |  | 208 | 687
Payments and utilization | (2) |  | (8) | (13) |  |  |  |  |  | (860) | 0
Foreign exchange | 0 |  | 1 | (6) |  |  |  |  |  | 7 | 0
End of period | 4 |  | 11 | 20 |  | 4 |  |  |  | 42 | 687
Other |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning of period | 0 |  | 0 | 0 |  | 0 |  | $ 25 |  | 25 | 0
Restructuring charges | 0 |  | 0 | 0 |  |  |  |  |  | 54 | 94
Change in estimate | 0 |  | 0 | 0 |  |  |  |  |  | (3) | 0
Net restructuring charges | 0 |  | 0 | 0 |  |  |  |  |  | 51 | 94
Payments and utilization | 0 |  | 0 | 0 |  |  |  |  |  | (76) | (69)
Foreign exchange | 0 |  | 0 | 0 |  |  |  |  |  | 0 | 0
End of period | $ 0 |  | $ 0 | $ 0 |  | $ 0 |  |  |  | $ 0 | $ 25
[1] | Effective January 1, 2025, certain transaction processing fees paid by Citi, primarily to credit card networks, which were previously presented within Other operating expenses, are presented as contra-revenue within Commissions and fees reported in Non-interest revenue. Prior periods were conformed to reflect this change in presentation.

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