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, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]              
Unemployment rate, previous economic outlook     5.00%        
U.S. gross domestic product, previous economic outlook     2.10%        
Allowance for credit losses     $ 14,222   $ 14,222 $ 13,843 $ 20,680
Allowance for credit losses, period increase         379    
Loan and leases receivable, allowance, period increase (decrease)         295    
Reserve for unfunded lending commitments, period increase         84    
Increase in provision for credit losses         7,100    
Provision (benefit) for credit losses         2,543 (4,594) 11,320
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         68,700    
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% 5.50%          
U.S. gross domestic product, current economic outlook 1.20% 0.40%          
Unemployment rate, previous economic outlook   5.00%          
U.S. gross domestic product, previous economic outlook   1.90%          
Credit card and other consumer              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses     6,817   6,817 6,476 9,213
Loan and leases receivable, allowance, period increase (decrease)         341    
Commercial              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses     6,891   6,891 6,714 10,472
Loan and leases receivable, allowance, period increase (decrease)         177    
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         47,700    
Consumer real estate              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses     $ 514   514 $ 653 $ 995
Loan and leases receivable, allowance, period increase (decrease)         (139)    
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         $ 21,000