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
 12 Months Ended
Dec. 31, 2021
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]                
Allowance for credit losses     $ 20,680 $ 20,680 $ 10,229   $ 10,398  
Allowance for loan and lease losses     18,802 18,802 9,416 $ 9,601 9,601 $ 10,393
Reserve for unfunded lending commitments   $ 1,123 1,878 1,878 813 797 797 777
Reserve for unfunded lending commitments, period increase (decrease)       755        
Allowance for credit losses, period increase (decrease)       7,200        
Loan and leases receivable, allowance, period increase (decrease)       6,400        
Outstanding loans and Leases, period increase (decrease), excluding loans accounted for under the fair value option     (53,900)          
Scenario, Forecast                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Unemployment rate, economic outlook 6.50%              
Credit card and other consumer                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Allowance for credit losses     9,213 9,213 3,996   3,874  
Allowance for loan and lease losses     9,213 9,213 3,996 3,874 3,874 3,663
Reserve for unfunded lending commitments   0 0 0 0 0 0 0
Loan and leases receivable, allowance, period increase (decrease)       1,800        
Consumer real estate                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Allowance for credit losses     995 995 546   928  
Allowance for loan and lease losses     858 858 546 928 928 1,720
Reserve for unfunded lending commitments   119 137 137 0 0 0 0
Loan and leases receivable, allowance, period increase (decrease)       418        
Outstanding loans and Leases, period increase (decrease), excluding loans accounted for under the fair value option     (37,100)          
Commercial                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Allowance for credit losses     10,472 10,472 5,687   5,596  
Allowance for loan and lease losses     8,731 8,731 4,874 4,799 4,799 5,010
Reserve for unfunded lending commitments   1,004 $ 1,741 1,741 813 $ 797 $ 797 $ 777
Loan and leases receivable, allowance, period increase (decrease)       $ 4,200        
Cumulative Effect, Period of Adoption, Adjustment                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Allowance for credit losses   $ 3,300     $ 3,300      
Loans and leases receivable, percentage increase in allowance   32.00%            
Allowance for loan and lease losses   $ 2,900            
Reserve for unfunded lending commitments   310            
Cumulative Effect, Period of Adoption, Adjustment | Credit card and other consumer                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Allowance for loan and lease losses   3,100            
Cumulative Effect, Period of Adoption, Adjustment | Consumer real estate                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Reserve for unfunded lending commitments, period increase (decrease)   119            
Cumulative Effect, Period of Adoption, Adjustment | Commercial                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Reserve for unfunded lending commitments, period increase (decrease)   $ 191