SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Funding, Liquidity Facilities and Subordinated Interests (Details) - USD ($) $ in Billions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| Citibank Credit Card Master Trust (Master Trust) | ||
| Funding, Liquidity Facilities and Subordinated Interests | ||
| Weighted average maturity of term notes | 3 years 3 months 18 days | 3 years 7 months 6 days |
| Term notes issued to third parties | $ 6.3 | $ 4.3 |
| Term notes retained by Citigroup affiliates | 1.8 | 1.7 |
| Total Trust liabilities | $ 8.1 | $ 6.0 |
| Citibank OMNI Master Trust (Omni Trust) | ||
| Funding, Liquidity Facilities and Subordinated Interests | ||
| Weighted average maturity of term notes | 10 months 24 days | 1 year 4 months 24 days |
| Term notes issued to third parties | $ 0.9 | $ 0.9 |
| Term notes retained by Citigroup affiliates | 1.5 | 2.0 |
| Total Trust liabilities | $ 2.4 | $ 2.9 |