v3.25.4
ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses for Other Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]      
Allowance for credit losses on other assets at beginning of year $ 1,865 $ 1,788 $ 123
Gross credit losses (80) (53) (97)
Gross recoveries 34 27 25
Net credit losses (NCLs) (46) (26) (72)
Net reserve builds (releases) 421 336 1,690
Total provision for credit losses 467 362 1,762
Other, net (2,139) (259) (25)
Allowance for credit losses on other assets at end of year 147 1,865 1,788
Discontinued Operations, Held-for-sale | AO Citibank      
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]      
Other, net (2,600)    
Deposits with banks      
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]      
Allowance for credit losses on other assets at beginning of year 25 31 51
Gross credit losses 0 0 0
Gross recoveries 0 0 0
Net credit losses (NCLs) 0 0 0
Net reserve builds (releases) (2) (7) (19)
Total provision for credit losses (2) (7) (19)
Other, net 0 1 (1)
Allowance for credit losses on other assets at end of year 23 25 31
Securities borrowed and purchased under agreements to resell      
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]      
Allowance for credit losses on other assets at beginning of year 3 27 36
Gross credit losses 0 0 0
Gross recoveries 0 0 0
Net credit losses (NCLs) 0 0 0
Net reserve builds (releases) 2 (23) 14
Total provision for credit losses 2 (23) 14
Other, net 0 (1) (23)
Allowance for credit losses on other assets at end of year 5 3 27
All other assets      
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]      
Allowance for credit losses on other assets at beginning of year 1,837 1,730 36
Gross credit losses (80) (53) (97)
Gross recoveries 34 27 25
Net credit losses (NCLs) (46) (26) (72)
Net reserve builds (releases) 421 366 1,695
Total provision for credit losses 467 392 1,767
Other, net (2,139) (259) (1)
Allowance for credit losses on other assets at end of year $ 119 $ 1,837 $ 1,730