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Summary of Significant Accounting and Reporting Policies - Portfolio Loans and Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due    
Forecast lifespan 3 years  
Historical lookback period 2 years  
Large Commercial Loans and Leases    
Financing Receivable, Recorded Investment, Past Due    
Larger commercial loans, subject to impairment review $ 1  
Commercial Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due    
Loans modified as TDR maintained on accrual status, payment history, period 6 months  
Commercial Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due    
Threshold period past due for nonaccrual loans 90 days 90 days
Loans modified as TDR maintained on accrual status, payment history, period   6 months
Established threshold nonaccrual commercial loans $ 1  
Residential Mortgage | Residential mortgage loans    
Financing Receivable, Recorded Investment, Past Due    
Threshold period past due for nonaccrual loans 150 days 150 days
Foreclosure process, period 180 days 180 days
Threshold period past due for accrual loans 90 days 90 days
Consumer | Residential mortgage loans    
Financing Receivable, Recorded Investment, Past Due    
Threshold period past due for nonaccrual loans   90 days
Consumer | Home equity    
Financing Receivable, Recorded Investment, Past Due    
Threshold period past due for nonaccrual loans 90 days 90 days
Threshold period past due for nonaccrual loans, with senior lien in default 60 days 60 days
Senior lien in default, threshold period 120 days 120 days
Consumer | Credit card    
Financing Receivable, Recorded Investment, Past Due    
Threshold period past due 90 days 90 days
Consumer | Indirect Secured Consumer Loan And Other Consumer Loan    
Financing Receivable, Recorded Investment, Past Due    
Threshold period past due for nonaccrual loans 90 days 90 days
Consumer | Consumer Loan    
Financing Receivable, Recorded Investment, Past Due    
Threshold period past due for nonaccrual loans 60 days  
Consumer | Commercial And Credit Card Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due    
Loans modified as TDR maintained on accrual status, payment history, period   6 months
Commercial And Credit Card Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due    
Loans modified as TDR maintained on accrual status, payment history, period   6 months
Loans modified as TDR maintained on nonaccrual status, payment history, period 6 months