Quarterly report pursuant to Section 13 or 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, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]              
U.S. gross domestic product, current economic outlook       0.90%      
U.S. gross domestic product, previous economic outlook       0.40%      
Allowance for credit losses, period increase (decrease)     $ (271)        
Allowance for credit losses     13,951   $ 13,483    
Decrease to allowance for credit losses     (12,514) $ (12,682) (12,104)   $ (12,387)
Loan and leases receivable, allowance, period decrease     168        
Reserve for unfunded lending commitments, period decrease     103        
Increase in provision for credit losses     901        
Provision for credit losses     931   30    
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option     2,000        
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]              
Overall economic outlook for recessionary environment           95.00%  
Unemployment rate, current economic outlook 5.00% 5.00%          
U.S. gross domestic product, current economic outlook 1.40% 0.50%          
Unemployment rate, previous economic outlook 5.00% 5.50%          
U.S. gross domestic product, previous economic outlook 1.20% 0.40%          
Consumer real estate              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses, period increase (decrease)     123        
Allowance for credit losses     496   564    
Decrease to allowance for credit losses     (403) (420) (473)   (557)
Loan and leases receivable, allowance, period decrease     18        
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option     (4,200)        
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)     (394)        
Allowance for credit losses     6,497   6,677    
Decrease to allowance for credit losses     (5,153) (5,445) (5,389)   (5,354)
Loan and leases receivable, allowance, period decrease     394        
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option     6,300        
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     6,958   6,242    
Decrease to allowance for credit losses     (6,958) (6,817) $ (6,242)   $ (6,476)
Loan and leases receivable, allowance, period decrease     $ 141        
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