v3.25.4
RESTRUCTURING - Schedule of Restructuring Reserve Activity (Details) - USD ($)
$ in Millions
 12 Months Ended 27 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2025
Restructuring Reserve [Roll Forward]        
Beginning balance $ 42 $ 712 $ 0  
Restructuring charge (14) [1] 259 [1] 781 [1] $ 1,026
Payments and utilization (23) (936) (69)  
Foreign exchange (5) 7 0  
Restructuring charge 1 408    
Change in estimate (15) (149)    
Ending balance 0 42 712 0
Personnel costs        
Restructuring Reserve [Roll Forward]        
Beginning balance 42 687 0  
Restructuring charge (14) 208 687  
Payments and utilization (23) (860) 0  
Foreign exchange (5) 7 0  
Restructuring charge 1 354    
Change in estimate (15) (146)    
Ending balance 0 42 687 0
Other        
Restructuring Reserve [Roll Forward]        
Beginning balance 0 25 0  
Restructuring charge 0 51 94  
Payments and utilization 0 (76) (69)  
Foreign exchange 0 0 0  
Restructuring charge 0 54    
Change in estimate 0 (3)    
Ending balance $ 0 $ 0 $ 25 $ 0
[1] Effective January 1, 2025, certain transaction processing fees paid by Citi, primarily to credit card networks, which were previously presented within Other operating expenses, are presented as contra-revenue within Commissions and fees reported in Non-interest revenue. Prior periods were conformed to reflect this change in presentation.