v3.26.1
Other Assets - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Apr. 30, 2026
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Schedule Of Other Assets [Line Items]        
Acquired goodwill   $ 6,590,000,000   $ 5,949,000,000
Accumulated depreciation and amortization   15,400,000,000   15,170,000,000
Property, leasehold improvements and equipment   $ 7,534,000,000   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  
Investments in qualified affordable housing projects   4,060,000,000   4,123,000,000
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    
Industry Ventures | Subsequent Event        
Schedule Of Other Assets [Line Items]        
Payments to acquire business $ 1,500,000,000      
Equity payable $ 400,000,000      
Contingent considerations, shares issuable (in shares) 63,000      
Building and Building Improvements        
Schedule Of Other Assets [Line Items]        
Property, leasehold improvements and equipment   6,510,000,000   6,550,000,000
Asset & Wealth Management        
Schedule Of Other Assets [Line Items]        
Assets held for sale   $ 112,000,000   $ 124,000,000