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Loans - Summary of TDRs (Detail) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
TDR Loans   $ 266 $ 200
Residential mortgage loan TDR carried at lower of amortized cost or fair value less cost to sell   101 104
Non Accrual loans included in TDR loan   111 115
Commercial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
TDR Loans   115 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   112 38
Commercial loans | Global banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
TDR Loans   3 25
Consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
TDR Loans   151 137
Transfer TDR loans held-for-sale to portfolio loans $ 24    
Consumer loans | Residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
TDR Loans   137 125
Consumer loans | Home equity mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
TDR Loans   12 9
Consumer loans | Credit cards      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
TDR Loans   $ 2 $ 3