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Loans - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
loan_payment
loan_segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Loans and Leases Receivable Disclosure [Line Items]      
Number of portfolio segments | loan_segment 3    
Net gains/(losses) on sales of loans and lending-related commitments $ 56 $ (186) $ 261
Net gains (losses) on sales of loans $ 62 $ (48) $ 253
Residential real estate | Maximum      
Loans and Leases Receivable Disclosure [Line Items]      
Number of months before updating exterior opinion on home valuation 12 months    
Commercial real estate | Minimum      
Loans and Leases Receivable Disclosure [Line Items]      
Number of months before updating collateral values on commercial real estate loans 6 months    
Commercial real estate | Maximum      
Loans and Leases Receivable Disclosure [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, unmodified credit card loans, and business banking loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 180 days    
120 or more days past due | Scored auto and modified credit card loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 120 days    
Less than 60 days until charge-off | Residential real estate and auto loans      
Loans and Leases Receivable Disclosure [Line Items]      
Period past due, credit analysis factors, charge off criteria 60 days    
Consumer, excluding credit card | Minimum      
Loans and Leases Receivable Disclosure [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      
Loans and Leases Receivable Disclosure [Line Items]      
Period past due, credit analysis factors, charge off criteria 90 days    
Consumer, excluding credit card | 30 or more days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Period past due, credit analysis factors, charge off criteria 30 days