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Loans - Summary of Nonaccrual Loans and Accruing Receivables 90 Days or More Delinquent (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans $ 602 $ 435
Accruing Loans Contractually Past Due 90 Days or More 6 4
Nonaccrual Loans With No Allowance For Credit Losses 205 229
Residential mortgage loans carried at lower of cost or fair value of the collateral less cost to sell 108 109
Commercial loans    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 424 215
Accruing Loans Contractually Past Due 90 Days or More 1 1
Nonaccrual Loans With No Allowance For Credit Losses 119 145
Commercial loans | Real estate, including construction    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 229 45
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 40 43
Commercial loans | Business and corporate banking    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 143 116
Accruing Loans Contractually Past Due 90 Days or More 1 1
Nonaccrual Loans With No Allowance For Credit Losses 29 62
Commercial loans | Global banking    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 49 54
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 48 40
Commercial loans | Other commercial    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 3  
Accruing Loans Contractually Past Due 90 Days or More 0  
Nonaccrual Loans With No Allowance For Credit Losses 2  
Consumer loans    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 178 220
Accruing Loans Contractually Past Due 90 Days or More 5 3
Nonaccrual Loans With No Allowance For Credit Losses 86 84
Consumer loans | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 172 213
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 81 79
Consumer loans | Home equity mortgages    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 6 7
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 5 5
Consumer loans | Credit cards    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 0 0
Accruing Loans Contractually Past Due 90 Days or More 3 2
Nonaccrual Loans With No Allowance For Credit Losses 0 0
Consumer loans | Other consumer    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 0 0
Accruing Loans Contractually Past Due 90 Days or More 2 1
Nonaccrual Loans With No Allowance For Credit Losses $ 0 $ 0