v3.25.4
Summary of Significant Accounting Policies (Details) - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Summary of Significant Accounting Policies [Line Items]      
Fair value measurement, accounting policy exception [true false] true    
Financing receivable, modified, return to accrual status, required payment performance period 6 months    
Foreclosed assets measurement finalization period after foreclosure 90 days    
Debt securities, held-to-maturity, accounting policy election, not to measure allowance for credit loss for accrued interest [true false] true    
Financing receivable, accounting policy election, not to measure allowance for credit loss for accrued interest [true false] true    
Net investment in lease, accounting policy election, not to measure allowance for credit loss for accrued interest [true false] true    
Lessor, direct financing lease, existence of option to extend [true false] true    
Lessor, direct financing lease, existence of lessee option to purchase underlying asset [true false] true    
Lessor, direct financing lease, existence of option to terminate [true false] true    
Lessor, sales-type lease, existence of option to extend [true false] true    
Lessor, sales-type lease, existence of lessee option to purchase underlying asset [true false] true    
Lessor, sales-type lease, existence of option to terminate [true false] true    
Lease, practical expedient, lessor single lease component [true false] true    
Lessee, operating lease, existence of option to extend [true false] true    
Lessee, operating lease, existence of option to terminate [true false] true    
Property, plant and equipment, depreciation method [Extensible Enumeration] Depreciation Method, Straight-Line [Member]    
Depreciation and amortization expense for premises and equipment $ 1.7 $ 1.4 $ 1.3
Defined benefit plan, pension amortization, pension actuarial gain or loss amortization corridor percentage 5.00%    
Defined benefit plan, pension amortization, estimated average remaining participation period 17 years    
Customer relationship and other amortized intangibles [Member]      
Summary of Significant Accounting Policies [Line Items]      
Finite-lived intangible asset, useful life 10 years    
Building and building improvements [Member]      
Summary of Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 40 years    
Furniture and equipment [Member]      
Summary of Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 10 years    
Leasehold improvements [Member]      
Summary of Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 8 years    
Total Commercial [Member]      
Summary of Significant Accounting Policies [Line Items]      
Financing receivable, threshold period past due, nonaccrual status 90 days    
Financing receivable, threshold period past due, writeoff 180 days    
Total Consumer [Member] | Residential mortgage [Member]      
Summary of Significant Accounting Policies [Line Items]      
Financing receivable, threshold period past due, nonaccrual status 120 days    
Financing receivable, threshold period past due, writeoff 180 days    
Total Consumer [Member] | First lien mortgage [Member]      
Summary of Significant Accounting Policies [Line Items]      
Financing receivable, threshold period past due, nonaccrual status 120 days    
Total Consumer [Member] | Auto [Member]      
Summary of Significant Accounting Policies [Line Items]      
Financing receivable, threshold period past due, writeoff 120 days    
Total Consumer [Member] | Credit card [Member]      
Summary of Significant Accounting Policies [Line Items]      
Financing receivable, threshold period past due, writeoff 180 days    
Total Consumer [Member] | Unsecured loan [Member]      
Summary of Significant Accounting Policies [Line Items]      
Financing receivable, threshold period past due, writeoff 120 days    
Total Consumer [Member] | Unsecured line of credit [Member]      
Summary of Significant Accounting Policies [Line Items]      
Financing receivable, threshold period past due, writeoff 180 days    
Total Consumer [Member] | Other secured loan [Member]      
Summary of Significant Accounting Policies [Line Items]      
Financing receivable, threshold period past due, writeoff 120 days    
Total Consumer [Member] | Credit card and consumer lines of credit [Member]      
Summary of Significant Accounting Policies [Line Items]      
Financing receivable accrued interest, threshold period past due, writeoff 180 days