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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Assets and Liabilities of VIEs (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Assets of consolidated VIEs to be used to settle obligations of consolidated VIEs        
Cash and due from banks $ 23,625 $ 23,717 $ 24,463  
Trading account assets 593,473 537,139    
Investments 444,164 444,229    
Loans, net of unearned income 761,616 752,230    
Allowance for credit losses on loans (ACLL) (19,636) (19,247) (18,726) $ (18,574)
Total loans, net 741,980 732,983    
Other assets, at fair value 110,658 117,677    
Total assets 2,777,687 2,657,202    
Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of Citigroup        
Short-term borrowings 72,056 51,878    
Long-term debt 307,566 315,827    
Other liabilities 73,178 86,370    
Total liabilities 2,565,115 2,443,380    
Consumer loans        
Assets of consolidated VIEs to be used to settle obligations of consolidated VIEs        
Loans, net of unearned income 402,391 408,533    
Allowance for credit losses on loans (ACLL) (16,297) (16,194) (16,001) (16,018)
Corporate loans        
Assets of consolidated VIEs to be used to settle obligations of consolidated VIEs        
Loans, net of unearned income 359,225 343,697    
Allowance for credit losses on loans (ACLL) (3,339) (3,053) $ (2,725) $ (2,556)
Consolidated VIEs        
Assets of consolidated VIEs to be used to settle obligations of consolidated VIEs        
Cash and due from banks 105 105    
Trading account assets 6,509 7,488    
Investments 3,014 2,724    
Loans, net of unearned income 44,427 51,083    
Allowance for credit losses on loans (ACLL) (1,976) (2,142)    
Total loans, net 42,451 48,941    
Other assets, at fair value 445 143    
Total assets 52,524 59,401    
Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of Citigroup        
Short-term borrowings 13,752 9,690    
Long-term debt 5,420 5,419    
Other liabilities 353 400    
Total liabilities 19,525 15,509    
Consolidated VIEs | Consumer loans        
Assets of consolidated VIEs to be used to settle obligations of consolidated VIEs        
Loans, net of unearned income 24,962 31,181    
Consolidated VIEs | Corporate loans        
Assets of consolidated VIEs to be used to settle obligations of consolidated VIEs        
Loans, net of unearned income $ 19,465 $ 19,902