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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 (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     $ 7,208  
Provision for credit losses $ 4,246 $ 1,342 9,669 $ 3,035
Balance at the end of the period 16,832   16,832  
Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 14,073 7,313 7,208 7,220
Charge-offs (2,131) (2,157) (4,588) (4,430)
Recoveries 626 649 1,292 1,323
Net charge-offs (1,505) (1,508) (3,296) (3,107)
Provision for credit losses 4,252 1,329 9,619 3,013
Allowance build (release) for credit losses 2,747 (179) 6,323 (94)
Other changes 12 (1) (6) 7
Balance at the end of the period 16,832 7,133 16,832 7,133
Allowance for credit losses | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning 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  
Allowance for credit losses | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     10,515  
Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 223 131 135 122
Provision for credit losses (5) 13 46 22
Balance at the end of the period 218 144 218 144
Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     37  
Reserve for unfunded lending commitments | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     172  
Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period 17,050 7,277 17,050 7,277
Credit Card | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 10,346 5,568 5,395 5,535
Charge-offs (1,612) (1,711) (3,461) (3,493)
Recoveries 401 391 814 809
Net charge-offs (1,211) (1,320) (2,647) (2,684)
Provision for credit losses 2,944 1,095 6,646 2,484
Allowance build (release) for credit losses 1,733 (225) 3,999 (200)
Other changes 12 (1) (6) 7
Balance at the end of the period 12,091 5,342 12,091 5,342
Credit Card | Allowance for credit losses | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning 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  
Credit Card | Allowance for credit losses | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning 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 0
Provision for credit losses 0 0 0 0
Balance at the end of the period 0 0 0 0
Credit Card | Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0  
Credit Card | Reserve for unfunded lending commitments | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0  
Credit Card | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period 12,091 5,342 12,091 5,342
Consumer Banking | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 2,154 1,062 1,038 1,048
Charge-offs (416) (423) (912) (894)
Recoveries 224 251 474 501
Net charge-offs (192) (172) (438) (393)
Provision for credit losses 876 165 1,736 400
Allowance build (release) for credit losses 684 (7) 1,298 7
Other changes 0 0 0 0
Balance at the end of the period 2,838 1,055 2,838 1,055
Consumer Banking | Allowance for credit losses | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning 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  
Consumer Banking | Allowance for credit losses | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning 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 0 4 5 4
Provision for credit losses 0 0 0 0
Balance at the end of the period 0 4 0 4
Consumer Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     (5)  
Consumer Banking | Reserve for unfunded lending commitments | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0  
Consumer Banking | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period 2,838 1,059 2,838 1,059
Commercial Banking | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 1,573 683 775 637
Charge-offs (103) (23) (215) (43)
Recoveries 1 7 4 13
Net charge-offs (102) (16) (211) (30)
Provision for credit losses 432 69 1,237 129
Allowance build (release) for credit losses 330 53 1,026 99
Other changes 0 0 0 0
Balance at the end of the period 1,903 736 1,903 736
Commercial Banking | Allowance for credit losses | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning 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  
Commercial Banking | Allowance for credit losses | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     877  
Commercial Banking | Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 223 127 130 118
Provision for credit losses (5) 13 46 22
Balance at the end of the period 218 140 218 140
Commercial Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     42  
Commercial Banking | Reserve for unfunded lending commitments | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     172  
Commercial Banking | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period $ 2,121 $ 876 $ 2,121 $ 876