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Loans - Summary of Receivables which were Modified and as Result Became Classified as TDR Loans (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2022
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans $ 107 $ 118
Commercial loans    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans 99 101
Commercial loans | Business and corporate banking    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans 99 101
Consumer loans    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans 8 17
Consumer loans | Residential mortgages    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans 5 12
Consumer loans | Home equity mortgages    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans 2 2
Consumer loans | Credit cards    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans $ 1 $ 3