Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Outstanding Loans and Leases and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2021
Jul. 01, 2020
Dec. 31, 2019
Jul. 01, 2019
Jan. 01, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Allowance for credit losses     $ 21,506 $ 10,242 $ 21,506 $ 21,506 $ 10,242          
Allowance for loan and lease losses     19,596 9,433 19,596 19,596 9,433   $ 19,389 $ 9,416 $ 9,527 $ 9,601
Reserve for unfunded lending commitments $ 1,123   1,910 809 1,910 1,910 809   1,702   806 797
Reserve for unfunded lending commitments, period increase (decrease)           787            
Allowance for credit losses, period increase (decrease)         8,000              
Loan and leases receivable, allowance, period increase (decrease)           7,200            
Outstanding loans and Leases, period increase (decrease), excluding loans accounted for under the fair value option         (27,200)              
Loans and leases     955,172   955,172 955,172       983,426    
Increase (decrease) in provision for credit losses including unfunded lending commitments     610   8,600              
Provision for credit losses     1,389 779 11,267   2,649          
Commercial reservable criticized utilized exposure, amount     $ 35,700   $ 35,700 $ 35,700       $ 11,500    
Commercial reservable criticized utilized exposure, percent     6.55%   6.55% 6.55%       2.09%    
Nonperforming Loans and Leases     $ 4,550   $ 4,550 $ 4,550       $ 3,552    
Scenario, Forecast                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Unemployment rate, economic outlook   9.00%           7.00%        
Credit card and other consumer                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Allowance for credit losses     9,836 3,985 9,836 9,836 3,985          
Allowance for loan and lease losses     9,836 3,985 9,836 9,836 3,985   10,122   3,970 3,874
Reserve for unfunded lending commitments 0   0 0 0 0 0   0   0 0
Loan and leases receivable, allowance, period increase (decrease)           2,400            
Consumer real estate                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Allowance for credit losses     993 591 993 993 591          
Allowance for loan and lease losses     855 591 855 855 591   833   719 928
Reserve for unfunded lending commitments 119   138 0 138 138 0   141   0 0
Loan and leases receivable, allowance, period increase (decrease)           415            
Outstanding loans and Leases, period increase (decrease), excluding loans accounted for under the fair value option         (26,000)              
Loans and leases     36,530   36,530 36,530            
Commercial portfolio                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Allowance for credit losses     10,677 5,666 10,677 10,677 5,666          
Allowance for loan and lease losses     8,905 4,857 8,905 8,905 4,857   8,434   4,838 4,799
Reserve for unfunded lending commitments 1,004   1,772 $ 809 1,772 1,772 $ 809   $ 1,561   $ 806 $ 797
Loan and leases receivable, allowance, period increase (decrease)           4,400            
Loans and leases     515,379   515,379 515,379       517,657    
Nonperforming Loans and Leases     2,193   2,193 2,193       $ 1,499    
Cumulative Effect, Period of Adoption, Adjustment                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Allowance for credit losses $ 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 portfolio                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Reserve for unfunded lending commitments, period increase (decrease) 191                      
Cumulative Effect, Period of Adoption, Adjusted Balance                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Allowance for loan and lease losses 12,358                      
Cumulative Effect, Period of Adoption, Adjusted Balance | Credit card and other consumer                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Allowance for loan and lease losses 7,430                      
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer real estate                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Allowance for loan and lease losses 440                      
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial portfolio                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Allowance for loan and lease losses $ 4,488                      
Smalll Business Administration (SBA), CARES Act, Paycheck Protection Program                        
Financing Receivable, Allowance for Credit Loss [Line Items]                        
Loans and leases     $ 24,700   $ 24,700 $ 24,700