v3.26.1
ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Allowance for credit losses      
Allowance for credit losses on loans (ACLL) at beginning of period $ 19,247 $ 18,574  
Gross credit losses on loans (2,820) (2,926)  
Gross recoveries on loans 612 467  
Net credit losses (NCLs) on loans (2,208) (2,459)  
Net reserve builds (releases) for loans 301 227  
Net specific reserve builds (releases) for loans 96 (125)  
Total provision for credit losses on loans (PCLL) 2,605 2,561  
Other, net (see table below) (8) 50  
ACLL at end of period 19,636 18,726  
Allowance for credit losses on unfunded commitments      
Allowance for credit losses on unfunded commitments (ACLUC) at beginning of period 1,833 1,601  
Provision (release) for credit losses on ACLUC(2) 184 108  
Other, net (4) 11  
ACLUC at end of period 2,013 1,720  
Total ACLL and ACLUC 21,649 20,446  
Allowance for credit losses on other assets      
Allowance for credit losses on other assets at beginning of quarter(2) 147 1,865  
NCLs on other assets (3) (13)  
Provision for credit losses on other assets 33 39  
Other, net 9 315  
Allowance for credit losses on other assets at end of quarter 186 2,206  
Allowance for credit losses on HTM debt securities      
Allowance for credit losses on HTM debt securities at beginning of period 146 137  
Provision (release) for credit losses on HTM debt securities (30) (5)  
Other, net 0 (2)  
Allowance for credit losses on HTM debt securities at end of period 116 130  
Total ACL 21,951 22,782 $ 21,373
Sales or transfers of various consumer loan portfolios to HFS      
FX translation and other (8) 50  
Other, net (ACLL) (8) 50  
Reclassification 9 315  
Held for sale | AO Citibank      
Sales or transfers of various consumer loan portfolios to HFS      
Reclassification 2,600    
Corporate loans      
Allowance for credit losses      
Allowance for credit losses on loans (ACLL) at beginning of period 3,053 2,556  
Gross credit losses on loans (42) (199)  
Gross recoveries on loans 34 17  
Net credit losses (NCLs) on loans (8) (182)  
Net reserve builds (releases) for loans 203 279  
Net specific reserve builds (releases) for loans 96 (125)  
Other, net (see table below) (13) 15  
ACLL at end of period 3,339 2,725  
Sales or transfers of various consumer loan portfolios to HFS      
Other, net (ACLL) (13) 15  
Consumer loans      
Allowance for credit losses      
Allowance for credit losses on loans (ACLL) at beginning of period 16,194 16,018  
Gross credit losses on loans (2,778) (2,727)  
Gross recoveries on loans 578 450  
Net credit losses (NCLs) on loans (2,200) (2,277)  
Net reserve builds (releases) for loans 98 (52)  
Net specific reserve builds (releases) for loans 0 0  
Other, net (see table below) 5 35  
ACLL at end of period 16,297 16,001  
Sales or transfers of various consumer loan portfolios to HFS      
Other, net (ACLL) $ 5 $ 35