Quarterly report pursuant to Section 13 or 15(d)

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

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Outstanding Loans and Leases - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 01, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jan. 01, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses   $ 17,126 $ 10,379    
Allowance for loan and lease losses   15,766 9,577   $ 9,601
Reserve for unfunded lending commitments   1,360 802 $ 813 797
Loan and leases receivable, allowance, period increase (decrease)   3,400      
Reserve for unfunded lending commitments, period increase (decrease)   237      
Outstanding loans and Leases, period increase (decrease), excluding loans accounted for under the fair value option   $ 66,700      
Draws from existing unfunded loan commitments, percentage investment grade or collateralized   90.00%      
Increase (decrease) in provision for credit losses including unfunded lending commitments   $ 3,700      
Provision for credit losses   4,761 1,013    
Commercial reservable criticized utilized exposure, amount   $ 17,400   $ 11,500  
Commercial reservable criticized utilized exposure, percent   2.84%   2.09%  
Nonperforming Loans and Leases   $ 4,056   $ 3,552  
Credit card and other consumer          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses   8,258 3,934    
Allowance for loan and lease losses   8,258 3,934   3,874
Reserve for unfunded lending commitments   0 0   0
Loan and leases receivable, allowance, period increase (decrease)   828      
Consumer real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses   957 822    
Allowance for loan and lease losses   808 822   928
Reserve for unfunded lending commitments   149 0   0
Loan and leases receivable, allowance, period increase (decrease)   368      
Commercial portfolio          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses   7,911 5,623    
Allowance for loan and lease losses   6,700 4,821   4,799
Reserve for unfunded lending commitments   1,211 $ 802   $ 797
Loan and leases receivable, allowance, period increase (decrease)   2,200      
Nonperforming Loans and Leases   $ 1,852   $ 1,499  
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13          
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 | Accounting Standards Update 2016-13          
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 | Accounting Standards Update 2016-13          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Reserve for unfunded lending commitments 119        
Cumulative Effect, Period of Adoption, Adjustment | Commercial portfolio | Accounting Standards Update 2016-13          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Reserve for unfunded lending commitments 191        
Cumulative Effect, Period of Adoption, Adjusted Balance          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for loan and lease losses 12,358        
Reserve for unfunded lending commitments 1,123        
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        
Reserve for unfunded lending commitments 0        
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        
Reserve for unfunded lending commitments 119        
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        
Reserve for unfunded lending commitments $ 1,004