Annual report pursuant to Section 13 and 15(d)

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

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Outstanding Loans and Leases and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)     $ 329      
Allowance for credit losses     14,551 $ 14,222 $ 13,843  
Decrease to allowance for credit losses     (13,342) (12,682) (12,387) $ (18,802)
Loan and leases receivable, allowance, period increase     660      
Reserve for unfunded lending commitments, period decrease     331      
Increase in provision for credit losses     1,900      
Provision (benefit) for credit losses     4,394 2,543 (4,594)  
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option     10,200      
Cumulative Effect, Period of Adoption, Adjustment            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Decrease to allowance for credit losses       243    
Scenario, Forecast            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Unemployment rate, current economic outlook 5.00% 5.00%        
U.S. gross domestic product, current economic outlook 1.40% 0.30%        
Consumer real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)     1,300      
Allowance for credit losses     468 514 653  
Decrease to allowance for credit losses     (386) (420) (557) (858)
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option     3,700      
Consumer real estate | Cumulative Effect, Period of Adoption, Adjustment            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Decrease to allowance for credit losses       67    
Commercial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)     (942)      
Allowance for credit losses     5,949 6,891 6,714  
Decrease to allowance for credit losses     (4,822) (5,445) (5,354) (8,731)
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option     6,500      
Commercial | Cumulative Effect, Period of Adoption, Adjustment            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Decrease to allowance for credit losses       67    
Credit card and other consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses     8,134 6,817 6,476  
Decrease to allowance for credit losses     $ (8,134) (6,817) $ (6,476) $ (9,213)
Credit card and other consumer | Cumulative Effect, Period of Adoption, Adjustment            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Decrease to allowance for credit losses       $ 109