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Loans - Summary of Past Due Status of Loans With Payment Modifications (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Past Due [Line Items]    
Modified loans, past due $ 633 $ 628
30 - 89 Days    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 0 0
90+ Days    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 167 166
Current    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 466 462
Commercial loans    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 621 616
Commercial loans | Real estate, including construction    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 169 168
Commercial loans | Business and corporate banking    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 409 398
Commercial loans | Global banking    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 43 50
Commercial loans | 30 - 89 Days    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 0 0
Commercial loans | 30 - 89 Days | Real estate, including construction    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 0 0
Commercial loans | 30 - 89 Days | Business and corporate banking    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 0 0
Commercial loans | 30 - 89 Days | Global banking    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 0 0
Commercial loans | 90+ Days    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 167 166
Commercial loans | 90+ Days | Real estate, including construction    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 166 166
Commercial loans | 90+ Days | Business and corporate banking    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 0 0
Commercial loans | 90+ Days | Global banking    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 1 0
Commercial loans | Current    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 454 450
Commercial loans | Current | Real estate, including construction    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 3 2
Commercial loans | Current | Business and corporate banking    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 409 398
Commercial loans | Current | Global banking    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 42 50
Consumer loans    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 12 12
Consumer loans | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 12 12
Consumer loans | 30 - 89 Days    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 0 0
Consumer loans | 30 - 89 Days | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 0 0
Consumer loans | 90+ Days    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 0 0
Consumer loans | 90+ Days | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 0 0
Consumer loans | Current    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due 12 12
Consumer loans | Current | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Modified loans, past due $ 12 $ 12