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Summary of Significant Accounting Policies and New Accounting Pronouncements - Charge-Off and Nonaccrual Policies and Practices (Details)
12 Months Ended
Dec. 31, 2023
Commercial loans  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Number of days contractually delinquent 3 months
Consumer loans | Residential mortgages  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Number of days contractually delinquent 3 months
Period of consecutive payments 6 months
Delinquent threshold period 6 months
Update period 180 days
Valuation period from fair value determination date 90 days
Consumer loans | Credit cards  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Delinquent threshold period 6 months
Notification period 60 days
Delinquent threshold period involving a bankruptcy 180 days
Consumer loans | Other consumer  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Delinquent threshold period 4 months