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Loans - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
loan_segment
loan_payment
Jun. 30, 2019
USD ($)
Dec. 31, 2019
loan_segment
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of portfolio segments | loan_segment     3   3
Net gains (losses) on sales of loans and lending-related commitments $ 725   $ (188)    
Net gains (losses) on sales of loans $ 42 $ 0 $ (100) $ 0  
Residential real estate | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of months before updating exterior opinion on home valuation     12 months    
Commercial real estate | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of months before updating collateral values on commercial real estate loans     6 months    
Commercial real estate | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of months before updating collateral values on commercial real estate loans     12 months    
180 or more days past due | Residential real estate loans, non-modified credit card loans, and business banking loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, charge-off criteria, period past due 180 days   180 days    
120 or more days past due | Auto and modified credit card loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, charge-off criteria, period past due 120 days   120 days    
Less than 60 days until charge-off | Residential real estate and auto loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Period past due, credit analysis factors, charge off criteria     60 days    
Consumer, excluding credit card | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of months the borrower has performed under modified terms     6 months    
Number of payments under modified terms to recognize interest on cash basis | loan_payment     6    
Consumer, excluding credit card | 90 or more days past due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Period past due, credit analysis factors, charge off criteria     90 days    
Consumer, excluding credit card | 30 or more days past due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Period past due, credit analysis factors, charge off criteria     30 days