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DEPOSITS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Deposit Liability [Line Items] |  |  |  |  |  |
Non-interest-bearing deposits in U.S. offices |  | $ 116,921 |  | $ 116,921 |  | $ 123,338
Interest-bearing deposits in U.S. offices (including $1,878 and $1,262 as of September 30, 2025 and December 31, 2024, respectively, at fair value) |  | 592,728 |  | 592,728 |  | 551,547
Total deposits in U.S. offices |  | 709,649 |  | 709,649 |  | 674,885
Non-interest-bearing deposits in offices outside the U.S. (including $519 million and $383 million as of September 30, 2025 and December 31, 2024, respectively, at fair value) |  | 83,920 |  | 83,920 |  | 84,349
Interest-bearing deposits in offices outside the U.S. (including $1,287 and $1,963 as of September 30, 2025 and December 31, 2024, respectively, at fair value) |  | 590,360 |  | 590,360 |  | 525,224
Total deposits in offices outside the U.S. |  | 674,280 |  | 674,280 |  | 609,573
Total deposits |  | 1,383,929 |  | 1,383,929 |  | 1,284,458
Other operating(1)(3) | [1],[2] | 2,005 | $ 1,322 | 4,266 | $ 4,571 |
Fair value |  |  |  |  |  |
Deposit Liability [Line Items] |  |  |  |  |  |
Interest-bearing deposits in U.S. offices (including $1,878 and $1,262 as of September 30, 2025 and December 31, 2024, respectively, at fair value) |  | 1,878 |  | 1,878 |  | 1,262
Non-interest-bearing deposits in offices outside the U.S. (including $519 million and $383 million as of September 30, 2025 and December 31, 2024, respectively, at fair value) |  | 519 |  | 519 |  | 383
Interest-bearing deposits in offices outside the U.S. (including $1,287 and $1,963 as of September 30, 2025 and December 31, 2024, respectively, at fair value) |  | 1,287 |  | 1,287 |  | 1,963
Total deposits |  | $ 1,380,200 |  | $ 1,380,200 |  | $ 1,280,900
[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.
[2] | Effective July 1, 2025, certain expenses incurred in ongoing support of products and services that are predominantly variable costs, which were previously presented within Other operating expenses and Transactional and tax charges, are aggregated and presented within a new expenses category, Transactional and product servicing (see “Glossary” below for definition). Moreover, certain non-income tax charges incurred, which were previously presented within Transactional and tax charges and do not align with the redefined Transactional and product servicing, are presented within Other operating. Prior periods were conformed to reflect this change in presentation.

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