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Loans - Summary of TDRs (Detail) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
TDR Loans $ 157 $ 200
Residential mortgage loan TDR carried at lower of amortized cost or fair value less cost to sell 95 104
Non Accrual loans included in TDR loan 67 115
Commercial loans:    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
TDR Loans 23 63
Additional commitments to lend to commercial borrowers with modified TDRs 14 13
Commercial loans: | Business and corporate banking    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
TDR Loans 15 38
Commercial loans: | Global banking    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
TDR Loans 8 25
Consumer loans:    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
TDR Loans 134 137
Consumer loans: | Residential mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
TDR Loans 122 125
Consumer loans: | Home equity mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
TDR Loans 9 9
Consumer loans: | Credit cards    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
TDR Loans $ 3 $ 3