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Securitization Activities - Firms Continuing Involvement in Securitization Entities to Which Firm Sold Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Outstanding principal amount $ 115,351 $ 87,742
Retained interests 3,552 3,182
Purchased interests 266 66
U.S. government agency-issued CMOs [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Outstanding principal amount 33,984 20,841
Retained interests 955 906
Purchased interests 3 4
Other Residential Mortgage-backed [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Outstanding principal amount 23,262 24,262
Retained interests 1,114 1,170
Purchased interests 96 23
Other Commercial Mortgage-backed [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Outstanding principal amount 50,350 38,340
Retained interests 1,123 914
Purchased interests 130 39
Corporate debt and other asset-backed [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Outstanding principal amount 7,755 4,299
Retained interests 360 192
Purchased interests $ 37 $ 0