v3.25.2
SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Funding Commitments (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount $ 19,498 $ 16,351
Liquidity facilities    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0 0
Liquidity facilities | Non-agency-sponsored mortgage securitizations    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0 0
Liquidity facilities | Citi-administered asset-backed commercial paper conduits    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0 0
Liquidity facilities | Asset-backed securities    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0 0
Liquidity facilities | Municipal securities tender option bond trusts (TOBs)    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0 0
Liquidity facilities | Municipal investments    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0 0
Liquidity facilities | Investment funds    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0 0
Loan / equity commitments    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 19,498 16,351
Loan / equity commitments | Non-agency-sponsored mortgage securitizations    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 336 566
Loan / equity commitments | Citi-administered asset-backed commercial paper conduits    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0 0
Loan / equity commitments | Asset-backed securities    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 15,775 13,185
Loan / equity commitments | Municipal securities tender option bond trusts (TOBs)    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0 0
Loan / equity commitments | Municipal investments    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 3,293 2,502
Loan / equity commitments | Investment funds    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount $ 94 $ 98