v3.26.1
Loans - Summary of Nonaccrual Loans and Accruing Receivables 90 Days or More Delinquent (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans $ 816 $ 748
Accruing Loans Contractually Past Due 90 Days or More 3 4
Nonaccrual Loans With No Allowance For Credit Losses 194 123
Residential mortgage loans carried at lower of cost or fair value of the collateral less cost to sell 126 99
Commercial loans    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 600 533
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 93 50
Commercial loans | Commercial mortgages    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 247 257
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 1 2
Commercial loans | Business and corporate banking    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 353 273
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 92 46
Commercial loans | Other commercial    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans   3
Accruing Loans Contractually Past Due 90 Days or More   0
Nonaccrual Loans With No Allowance For Credit Losses   2
Consumer loans    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 216 215
Accruing Loans Contractually Past Due 90 Days or More 3 4
Nonaccrual Loans With No Allowance For Credit Losses 101 73
Consumer loans | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 208 206
Accruing Loans Contractually Past Due 90 Days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 95 67
Consumer loans | Other Consumer    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 8 9
Accruing Loans Contractually Past Due 90 Days or More 3 4
Nonaccrual Loans With No Allowance For Credit Losses $ 6 $ 6