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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Funding, Liquidity Facilities and Subordinated Interests (Details) - USD ($)
$ in Billions
 3 Months Ended 9 Months Ended
Mar. 31, 2025
Sep. 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 7 months 6 days 3 years 3 months 18 days  
Term notes issued to third parties   $ 6.0 $ 4.3
Term notes retained by Citigroup affiliates   1.9 1.7
Total Trust liabilities   $ 7.9 6.0
Citibank OMNI Master Trust (Omni Trust)      
Funding, Liquidity Facilities and Subordinated Interests      
Weighted average maturity of term notes 1 year 4 months 24 days 7 months 6 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