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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
Mar. 31, 2021
Mar. 31, 2020
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans $ 58 $ 18
Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans 41 12
Commercial Loan [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans 26 0
Commercial Loan [Member] | Global Banking [Member]    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans 15 12
Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans $ 17 $ 6
Weighted average rate of reduction 1.97% 3.04%
Consumer Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans $ 16 $ 4
Consumer Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans 0 1
Consumer Loans [Member] | Credit Cards [Member]    
Financing Receivable, Impaired [Line Items]    
Loans which were modified and as a result became classified as TDR Loans $ 1 $ 1