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Loans - Summary of Nonaccrual Loans and Accruing Receivables 90 Days or More Delinquent (Detail) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans $ 428 $ 617
Accruing Loans Contractually Past Due 90 Days or More 2 3
Nonaccrual Loans With No Allowance For Credit Losses 175 211
Residential mortgage loans carried at lower of cost or fair value of the collateral less cost to sell 63 86
Commercial loans:    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 291 379
Accruing Loans Contractually Past Due 90 Days or More 1 1
Nonaccrual Loans With No Allowance For Credit Losses 134 152
Commercial loans: | Real Estate, including Construction    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 92 140
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 18 20
Commercial loans: | Business and corporate banking    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 107 134
Accruing Loans Contractually Past Due 90 Days or More 1 1
Nonaccrual Loans With No Allowance For Credit Losses 52 69
Commercial loans: | Global banking    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 91 105
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 63 63
Commercial loans: | Other commercial:    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 1  
Accruing Loans Contractually Past Due 90 Days or More 0  
Nonaccrual Loans With No Allowance For Credit Losses 1  
Consumer loans:    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 137 238
Accruing Loans Contractually Past Due 90 Days or More 1 2
Nonaccrual Loans With No Allowance For Credit Losses 41 59
Consumer loans: | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 131 229
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 38 55
Consumer loans: | Home equity mortgages    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 6 9
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 3 4
Consumer loans: | Credit cards    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 0 0
Accruing Loans Contractually Past Due 90 Days or More 1 2
Nonaccrual Loans With No Allowance For Credit Losses $ 0 $ 0