v3.26.1
Other Assets - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Schedule Of Other Assets [Line Items]            
Acquired goodwill $ 7,342,000,000     $ 7,342,000,000   $ 5,949,000,000
Accumulated depreciation and amortization 15,830,000,000     15,830,000,000   15,170,000,000
Property, leasehold improvements and equipment 7,474,000,000     $ 7,474,000,000   7,474,000,000
Amortization period - capitalized costs of software developed or obtained for internal use       3 years 3 years  
Operating lease, impairment loss 0   $ 0 $ 0 $ 0  
Investments in qualified affordable housing projects 4,209,000,000     4,209,000,000   4,123,000,000
Noncash lease transaction         123,000,000  
Intangible asset, impairment loss 0   0 0 0  
Industry Ventures            
Schedule Of Other Assets [Line Items]            
Payments to acquire business   $ 360,000,000        
Equity payable   315,000,000        
Contingent consideration   140,000,000        
Contingent consideration, cash payable   $ 105,000,000        
Contingent considerations, shares issuable (in shares)   250,000        
Acquired goodwill   $ 655,000,000        
Acquired intangible assets   130,000,000        
Acquired tangible assets   $ 30,000,000        
Innovator Capital Management, LLC            
Schedule Of Other Assets [Line Items]            
Payments to acquire business 1,500,000,000          
Equity payable 400,000,000          
Contingent consideration $ 10,000,000     $ 10,000,000    
Contingent considerations, shares issuable (in shares) 63,000     63,000    
Acquired goodwill $ 770,000,000     $ 770,000,000    
Acquired intangible assets 1,070,000,000.00     1,070,000,000.00    
Acquired tangible assets 70,000,000     70,000,000    
Building and Building Improvements            
Schedule Of Other Assets [Line Items]            
Property, leasehold improvements and equipment 6,580,000,000     6,580,000,000   6,550,000,000
Asset & Wealth Management            
Schedule Of Other Assets [Line Items]            
Assets held for sale           $ 124,000,000
Asset & Wealth Management | Building and Building Improvements            
Schedule Of Other Assets [Line Items]            
Asset impairment charges $ 0   $ 115,000,000 $ 0 $ 123,000,000