v3.26.1
Loans, Leases and Allowance for Credit Losses - Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss $ 456 $ 385
Nonaccrual with an Allowance for Credit Loss 106 115
Total Nonaccrual 562 500
Loans Past Due 90 Days or More and Still Accruing 303 356
Municipal & nonprofit    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss   0
Nonaccrual with an Allowance for Credit Loss   4
Total Nonaccrual 0 4
Loans Past Due 90 Days or More and Still Accruing   3
Tech & innovation    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 6 12
Nonaccrual with an Allowance for Credit Loss 7 8
Total Nonaccrual 13 20
Loans Past Due 90 Days or More and Still Accruing 1 3
Equity fund resources    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 0 0
Nonaccrual with an Allowance for Credit Loss 1 1
Total Nonaccrual 1 1
Loans Past Due 90 Days or More and Still Accruing 0 0
Other commercial and industrial    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 123 71
Nonaccrual with an Allowance for Credit Loss 19 49
Total Nonaccrual 142 120
Loans Past Due 90 Days or More and Still Accruing 0 0
CRE - owner occupied    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 1 3
Nonaccrual with an Allowance for Credit Loss 0 0
Total Nonaccrual 1 3
Loans Past Due 90 Days or More and Still Accruing 0 0
Other CRE - non-owner occupied    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 215 188
Nonaccrual with an Allowance for Credit Loss 64 40
Total Nonaccrual 279 228
Loans Past Due 90 Days or More and Still Accruing 0 0
Residential    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 0 0
Nonaccrual with an Allowance for Credit Loss 14 12
Total Nonaccrual 14 12
Loans Past Due 90 Days or More and Still Accruing 54 51
Residential EBO    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 0 0
Nonaccrual with an Allowance for Credit Loss 0 0
Total Nonaccrual 0 0
Loans Past Due 90 Days or More and Still Accruing 248 290
Construction and land development    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 108 109
Nonaccrual with an Allowance for Credit Loss 1 0
Total Nonaccrual 109 109
Loans Past Due 90 Days or More and Still Accruing 0 9
Other    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 3 2
Nonaccrual with an Allowance for Credit Loss 0 1
Total Nonaccrual 3 3
Loans Past Due 90 Days or More and Still Accruing $ 0 $ 0