Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]    
Allowance for credit losses $ 17,997 $ 17,126
Allowance for credit losses, period increase (decrease) (2,700)  
Loan and leases receivable, allowance, period increase (decrease) (2,600)  
Reserve for unfunded lending commitments, period increase (decrease) (49)  
Outstanding loans and Leases, period increase (decrease), excluding loans accounted for under the fair value option (25,100)  
Consumer real estate    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Allowance for credit losses 813 957
Loan and leases receivable, allowance, period increase (decrease) (182)  
Outstanding loans and Leases, period increase (decrease), excluding loans accounted for under the fair value option (16,500)  
Credit card and other consumer    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Allowance for credit losses 7,946 8,258
Loan and leases receivable, allowance, period increase (decrease) (1,300)  
Commercial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Allowance for credit losses 9,238 $ 7,911
Loan and leases receivable, allowance, period increase (decrease) $ (1,200)