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Other Assets - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Schedule Of Other Assets [Line Items]          
Accumulated depreciation and amortization $ 15,010,000,000.00   $ 15,010,000,000.00   $ 13,640,000,000
Property, leasehold improvements and equipment 7,744,000,000   $ 7,744,000,000   8,024,000,000
Amortization period - capitalized costs of software developed or obtained for internal use     3 years 3 years  
Noncash lease transaction 113,000,000 $ 56,000,000 $ 236,000,000 $ 109,000,000  
Operating lease, impairment loss 0 0 0 0  
Investments in qualified affordable housing projects 3,343,000,000   3,343,000,000   3,456,000,000
Seller Financing Loan Portfolio          
Schedule Of Other Assets [Line Items]          
Goodwill, Impairment Loss   14,000,000      
GM          
Schedule Of Other Assets [Line Items]          
Assets held for sale         1,800,000,000
Building and Building Improvements          
Schedule Of Other Assets [Line Items]          
Property, leasehold improvements and equipment 6,550,000,000   6,550,000,000   6,570,000,000
Asset & Wealth Management          
Schedule Of Other Assets [Line Items]          
Assets held for sale 101,000,000   101,000,000   $ 517,000,000
Asset & Wealth Management | Land, Buildings and Improvements          
Schedule Of Other Assets [Line Items]          
Asset impairment charges $ 0 $ 0 $ 164,000,000 $ 200,000,000