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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
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2020
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period $ 7,208    
Allowance for Credit Losses [Roll Forward]      
Balance at the end of the period 14,073    
Allowance for credit losses      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period 7,208 $ 7,220  
Charge-offs   (2,273)  
Recoveries   674  
Net charge-offs   (1,599)  
Provision for loan and lease losses   1,684  
Allowance build for loan and lease losses   85  
Other changes   8  
Balance at the end of the period   7,313  
Allowance for Credit Losses [Roll Forward]      
Finance charge and fee reserve reclassification     $ 462
Charge-offs (2,457)    
Recoveries 666    
Net charge-offs (1,791)    
Provision for credit losses 5,367    
Allowance build for credit losses 3,576    
Other changes (18)    
Balance at the end of the period 14,073    
Allowance for credit losses | Adjustment amount      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 2,845    
Finance charge and fee reserve reclassification     462
Allowance for credit losses | Adjusted balance      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 10,515    
Reserve for unfunded lending commitments      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period 135    
Provision for loan and lease losses   9  
Balance at the end of the period   131  
Allowance for Credit Losses [Roll Forward]      
Provision for credit losses 51    
Balance at the end of the period 223    
Reserve for unfunded lending commitments | Adjustment amount      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 37    
Reserve for unfunded lending commitments | Adjusted balance      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period   122  
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 172    
Combined allowance and reserve      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the end of the period   7,444  
Allowance for Credit Losses [Roll Forward]      
Balance at the end of the period 14,296    
Credit Card      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period 5,395 5,535  
Charge-offs   (1,782)  
Recoveries   418  
Net charge-offs   (1,364)  
Provision for loan and lease losses   1,389  
Allowance build for loan and lease losses   25  
Other changes   8  
Balance at the end of the period   5,568  
Allowance for Credit Losses [Roll Forward]      
Charge-offs (1,849)    
Recoveries 413    
Net charge-offs (1,436)    
Provision for credit losses 3,702    
Allowance build for credit losses 2,266    
Other changes (18)    
Balance at the end of the period 10,346    
Credit Card | Adjustment amount      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 2,241    
Finance charge and fee reserve reclassification     462
Credit Card | Adjusted balance      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 8,098    
Credit Card | Reserve for unfunded lending commitments      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period 0    
Provision for loan and lease losses   0  
Balance at the end of the period   0  
Allowance for Credit Losses [Roll Forward]      
Provision for credit losses 0    
Balance at the end of the period 0    
Credit Card | Reserve for unfunded lending commitments | Adjustment amount      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 0    
Credit Card | Reserve for unfunded lending commitments | Adjusted balance      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period   0  
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 0    
Credit Card | Combined allowance and reserve      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the end of the period   5,568  
Allowance for Credit Losses [Roll Forward]      
Balance at the end of the period 10,346    
Consumer Banking      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period 1,038 1,048  
Charge-offs   (471)  
Recoveries   250  
Net charge-offs   (221)  
Provision for loan and lease losses   235  
Allowance build for loan and lease losses   14  
Other changes   0  
Balance at the end of the period   1,062  
Allowance for Credit Losses [Roll Forward]      
Charge-offs (496)    
Recoveries 250    
Net charge-offs (246)    
Provision for credit losses 860    
Allowance build for credit losses 614    
Other changes 0    
Balance at the end of the period 2,154    
Consumer Banking | Adjustment amount      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 502    
Finance charge and fee reserve reclassification     0
Consumer Banking | Adjusted balance      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 1,540    
Consumer Banking | Reserve for unfunded lending commitments      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period 5    
Provision for loan and lease losses   0  
Balance at the end of the period   4  
Allowance for Credit Losses [Roll Forward]      
Provision for credit losses 0    
Balance at the end of the period 0    
Consumer Banking | Reserve for unfunded lending commitments | Adjustment amount      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period (5)    
Consumer Banking | Reserve for unfunded lending commitments | Adjusted balance      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period   4  
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 0    
Consumer Banking | Combined allowance and reserve      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the end of the period   1,066  
Allowance for Credit Losses [Roll Forward]      
Balance at the end of the period 2,154    
Commercial Banking      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period 775 637  
Charge-offs   (20)  
Recoveries   6  
Net charge-offs   (14)  
Provision for loan and lease losses   60  
Allowance build for loan and lease losses   46  
Other changes   0  
Balance at the end of the period   683  
Allowance for Credit Losses [Roll Forward]      
Charge-offs (112)    
Recoveries 3    
Net charge-offs (109)    
Provision for credit losses 805    
Allowance build for credit losses 696    
Other changes 0    
Balance at the end of the period 1,573    
Commercial Banking | Adjustment amount      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 102    
Finance charge and fee reserve reclassification     $ 0
Commercial Banking | Adjusted balance      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 877    
Commercial Banking | Reserve for unfunded lending commitments      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period 130    
Provision for loan and lease losses   9  
Balance at the end of the period   127  
Allowance for Credit Losses [Roll Forward]      
Provision for credit losses 51    
Balance at the end of the period 223    
Commercial Banking | Reserve for unfunded lending commitments | Adjustment amount      
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 42    
Commercial Banking | Reserve for unfunded lending commitments | Adjusted balance      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the beginning of the period   118  
Allowance for Credit Losses [Roll Forward]      
Balance at the beginning of the period 172    
Commercial Banking | Combined allowance and reserve      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at the end of the period   $ 810  
Allowance for Credit Losses [Roll Forward]      
Balance at the end of the period $ 1,796