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Allowance for Credit Losses and Reserve for Unfunded Lending Commitments - Allowance for Loan and Lease Losses and Reserve for Unfunded Lending Commitments Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   $ 7,208    
Provision for credit losses   10,264 $ 6,236 $ 5,856
Balance at the end of the period   15,564 7,208  
Other        
Allowance for Credit Losses [Roll Forward]        
Provision for credit losses   3 0 (49)
Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   7,208 7,220 7,502
Charge-offs   (7,677) (8,809) (8,615)
Recoveries   2,452 2,557 2,503
Net charge-offs   (5,225) (6,252) (6,112)
Provision for credit losses   10,238 6,223 5,858
Allowance build (release) for credit losses   5,013 (29) (254)
Other changes   36 17 (28)
Balance at the end of the period   15,564 7,208 7,220
Allowance for credit losses | Other        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0 1
Charge-offs       (7)
Recoveries       1
Net charge-offs       (6)
Provision for credit losses       (49)
Allowance build (release) for credit losses       (55)
Other changes       54
Balance at the end of the period       0
Allowance for credit losses | Cumulative effects from adoption of new accounting standards        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   2,845    
Balance at the end of the period     2,845  
Allowance for credit losses | Finance charge and fee reserve reclassification        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   462    
Balance at the end of the period     462  
Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   10,515    
Balance at the end of the period     10,515  
Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   135 122 124
Provision for credit losses   23 13 (2)
Balance at the end of the period   195 135 122
Reserve for unfunded lending commitments | Other        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0 0
Provision for credit losses       0
Balance at the end of the period       0
Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   37    
Balance at the end of the period     37  
Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   172    
Balance at the end of the period     172  
Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   7,343 7,342  
Balance at the end of the period   15,759 7,343 7,342
Combined allowance and reserve | Other        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0  
Balance at the end of the period       0
Credit Card | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   5,395 5,535 5,648
Charge-offs   (5,749) (6,711) (6,657)
Recoveries   1,479 1,562 1,588
Net charge-offs   (4,270) (5,149) (5,069)
Provision for credit losses   7,327 4,992 4,984
Allowance build (release) for credit losses   3,057 (157) (85)
Other changes   36 17 (28)
Balance at the end of the period   11,191 5,395 5,535
Credit Card | Allowance for credit losses | Cumulative effects from adoption of new accounting standards        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   2,241    
Balance at the end of the period     2,241  
Credit Card | Allowance for credit losses | Finance charge and fee reserve reclassification        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   462    
Balance at the end of the period     462  
Credit Card | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   8,098    
Balance at the end of the period     8,098  
Credit Card | Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   0 0 0
Provision for credit losses   0 0 0
Balance at the end of the period   0 0 0
Credit Card | Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   0    
Balance at the end of the period     0  
Credit Card | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   0    
Balance at the end of the period     0  
Credit Card | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   5,395 5,535  
Balance at the end of the period   11,191 5,395 5,535
Consumer Banking | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   1,038 1,048 1,242
Charge-offs   (1,534) (1,917) (1,832)
Recoveries   956 970 851
Net charge-offs   (578) (947) (981)
Provision for credit losses   1,753 937 841
Allowance build (release) for credit losses   1,175 (10) (140)
Other changes   0 0 (54)
Balance at the end of the period   2,715 1,038 1,048
Consumer Banking | Allowance for credit losses | Cumulative effects from adoption of new accounting standards        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   502    
Balance at the end of the period     502  
Consumer Banking | Allowance for credit losses | Finance charge and fee reserve reclassification        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   0    
Balance at the end of the period     0  
Consumer Banking | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   1,540    
Balance at the end of the period     1,540  
Consumer Banking | Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   5 4 7
Provision for credit losses   0 1 (3)
Balance at the end of the period   0 5 4
Consumer Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   (5)    
Balance at the end of the period     (5)  
Consumer Banking | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   0    
Balance at the end of the period     0  
Consumer Banking | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   1,043 1,052  
Balance at the end of the period   2,715 1,043 1,052
Commercial Banking | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   775 637 611
Charge-offs   (394) (181) (119)
Recoveries   17 25 63
Net charge-offs   (377) (156) (56)
Provision for credit losses   1,158 294 82
Allowance build (release) for credit losses   781 138 26
Other changes   0 0 0
Balance at the end of the period   1,658 775 637
Commercial Banking | Allowance for credit losses | Cumulative effects from adoption of new accounting standards        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   102    
Balance at the end of the period     102  
Commercial Banking | Allowance for credit losses | Finance charge and fee reserve reclassification        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   0    
Balance at the end of the period     0  
Commercial Banking | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   877    
Balance at the end of the period     877  
Commercial Banking | Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   130 118 117
Provision for credit losses   23 12 1
Balance at the end of the period   195 130 118
Commercial Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   42    
Balance at the end of the period     42  
Commercial Banking | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   172    
Balance at the end of the period     172  
Commercial Banking | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period   905 755  
Balance at the end of the period   $ 1,853 $ 905 755
Partnership Credit Card Loan Portfolio | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Allowance build (release) for credit losses $ 327      
Residential Portfolio Segment | Other        
Allowance for Credit Losses [Roll Forward]        
Gain in other category       499
Benefit for credit losses       $ 46