Quarterly report [Sections 13 or 15(d)]

Outstanding Loans and Leases and Allowance for Credit Losses - Allowance for Credit Losses Narrative (Details)

v3.26.1
Outstanding Loans and Leases and Allowance for Credit Losses - Allowance for Credit Losses Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2027
Dec. 31, 2026
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period increase (decrease)     $ (71)  
Allowance for credit losses     14,309 $ 14,366
Decrease in allowance for loan and lease losses     55  
Reserve for unfunded lending commitments, period decrease     16  
Decrease in provision for credit losses     143  
Provision for credit losses     1,337 1,480
Increase (decrease) in net charge-offs     (43)  
Net charge-offs     1,409 1,452
Credit card and other consumer        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period increase (decrease)     (110)  
Allowance for credit losses     7,854 8,212
Net charge-offs     1,061 1,131
Commercial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period increase (decrease)     25  
Allowance for credit losses     5,963 5,757
Decrease in provision for credit losses     6  
Increase (decrease) in net charge-offs     17  
Net charge-offs     350 333
Consumer real estate        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period increase (decrease)     14  
Allowance for credit losses     492 397
Net charge-offs     (2) $ (12)
Consumer        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Decrease in provision for credit losses     137  
Increase (decrease) in net charge-offs     $ (60)  
Scenario, Forecast        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Unemployment rate, current economic outlook (just below)   5.00%    
U.S. gross domestic product, current economic outlook (as a percent) 1.80% 1.50%