SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset-Backed Commercial Paper Conduits (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Classification of Other Securitization Details | ||
| Commercial paper | $ 19,941 | $ 28,916 |
| Short-term borrowings | 51,878 | 48,505 |
| Municipal securities tender option bond trusts (TOBs) | ||
| Classification of Other Securitization Details | ||
| Short-term borrowings | 2,900 | 800 |
| Citi-administered asset-backed commercial paper conduits | ||
| Classification of Other Securitization Details | ||
| Purchased assets outstanding under conduits | 19,200 | 21,300 |
| Incremental funding commitments with clients | $ 17,500 | $ 16,700 |
| Weighted average life of commercial paper issued by conduits | 58 days | 82 days |
| Citi-administered asset-backed consolidated commercial paper conduits (ABCP) | ||
| Classification of Other Securitization Details | ||
| Letters of credit provided to conduits | $ 2,000 | $ 2,100 |
| Commercial paper | $ 9,200 | $ 6,400 |