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Loans - Summary of Subsequently Delinquent Loans With Payment Modifications (Details) - 90+ Days - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Commercial loans    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default $ 30 $ 166
Commercial loans | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 0 0
Commercial loans | Principal Forgiveness    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 0 0
Commercial loans | Term Extension / Significant Payment Deferral    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 30 166
Commercial loans | Combination    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 0 0
Commercial loans | Business and corporate banking    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 29  
Commercial loans | Business and corporate banking | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 0  
Commercial loans | Business and corporate banking | Principal Forgiveness    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 0  
Commercial loans | Business and corporate banking | Term Extension / Significant Payment Deferral    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 29  
Commercial loans | Business and corporate banking | Combination    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 0  
Commercial loans | Global banking    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 1  
Commercial loans | Global banking | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 0  
Commercial loans | Global banking | Principal Forgiveness    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 0  
Commercial loans | Global banking | Term Extension / Significant Payment Deferral    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 1  
Commercial loans | Global banking | Combination    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default 0  
Commercial loans | Real estate, including construction    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default   166
Commercial loans | Real estate, including construction | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default   0
Commercial loans | Real estate, including construction | Principal Forgiveness    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default   0
Commercial loans | Real estate, including construction | Term Extension / Significant Payment Deferral    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default   166
Commercial loans | Real estate, including construction | Combination    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default   0
Consumer loans    
Financing Receivable, Modified [Line Items]    
Loans modified, subsequently default $ 0 $ 0