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Loans - Summary of the Financial Effect of Loan Payment Modifications (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Commercial loans | Real estate, including construction    
Financing Receivable, Modified [Line Items]    
Weighted-Average Interest Rate Reduction   0.00%
Weighted-Average Term Extension / Payment Deferral (in years)   4 months 24 days
Commercial loans | Real estate, including construction | Principal Forgiven    
Financing Receivable, Modified [Line Items]    
Principal Forgiven (in millions)   $ 0
Commercial loans | Business and corporate banking    
Financing Receivable, Modified [Line Items]    
Weighted-Average Interest Rate Reduction 0.00% 0.00%
Weighted-Average Term Extension / Payment Deferral (in years) 1 year 9 months 18 days 2 years 3 months 18 days
Commercial loans | Business and corporate banking | Principal Forgiven    
Financing Receivable, Modified [Line Items]    
Principal Forgiven (in millions) $ 0 $ 2
Consumer loans | Residential mortgages    
Financing Receivable, Modified [Line Items]    
Weighted-Average Interest Rate Reduction   3.00%
Weighted-Average Term Extension / Payment Deferral (in years)   7 years 7 months 6 days
Consumer loans | Residential mortgages | Principal Forgiven    
Financing Receivable, Modified [Line Items]    
Principal Forgiven (in millions)   $ 0
Consumer loans | Credit cards    
Financing Receivable, Modified [Line Items]    
Weighted-Average Interest Rate Reduction   0.00%
Weighted-Average Term Extension / Payment Deferral (in years)   6 months
Consumer loans | Credit cards | Principal Forgiven    
Financing Receivable, Modified [Line Items]    
Principal Forgiven (in millions)   $ 0