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
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss $ 424 $ 385
Nonaccrual with an Allowance for Credit Loss 68 115
Total Nonaccrual 492 500
Loans Past Due 90 Days or More and Still Accruing 344 356
Municipal & nonprofit    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 0 0
Nonaccrual with an Allowance for Credit Loss 4 4
Total Nonaccrual 4 4
Loans Past Due 90 Days or More and Still Accruing 3 3
Tech & innovation    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 12 12
Nonaccrual with an Allowance for Credit Loss 10 8
Total Nonaccrual 22 20
Loans Past Due 90 Days or More and Still Accruing 0 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 71 71
Nonaccrual with an Allowance for Credit Loss 27 49
Total Nonaccrual 98 120
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 3 3
Nonaccrual with an Allowance for Credit Loss 0 0
Total Nonaccrual 3 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 250 188
Nonaccrual with an Allowance for Credit Loss 13 40
Total Nonaccrual 263 228
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 13 12
Total Nonaccrual 13 12
Loans Past Due 90 Days or More and Still Accruing 53 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 288 290
Construction and land development    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with No Allowance for Credit Loss 85 109
Nonaccrual with an Allowance for Credit Loss 0 0
Total Nonaccrual 85 109
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