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Variable Interest Entities and Securitization Activities - Mortgage and Asset Backed Securitization Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Variable Interest Entity    
Debt and Equity Interests $ 1,364,806 $ 1,215,071
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity    
UPB 176,657 179,686
Variable Interest Entity, Not Primary Beneficiary | Residential mortgages    
Variable Interest Entity    
UPB 14,893 17,316
Variable Interest Entity, Not Primary Beneficiary | Commercial mortgages    
Variable Interest Entity    
UPB 42,986 82,730
Variable Interest Entity, Not Primary Beneficiary | U.S. agency collateralized mortgage obligations    
Variable Interest Entity    
UPB 87,668 39,317
Variable Interest Entity, Not Primary Beneficiary | Other consumer or commercial loans    
Variable Interest Entity    
UPB 31,110 40,323
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests    
Variable Interest Entity    
Debt and Equity Interests 29,770 26,974
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | Residential mortgages    
Variable Interest Entity    
Debt and Equity Interests 2,878 2,497
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | Commercial mortgages    
Variable Interest Entity    
Debt and Equity Interests 9,592 8,445
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | U.S. agency collateralized mortgage obligations    
Variable Interest Entity    
Debt and Equity Interests 7,719 6,260
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | Other consumer or commercial loans    
Variable Interest Entity    
Debt and Equity Interests $ 9,581 $ 9,772