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Variable Interest Entities - Multi-seller conduits (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Unfunded lending-related commitments $ 1,576,476 $ 1,497,847
Multi-seller conduits    
Variable Interest Entity [Line Items]    
Commercial paper eliminated in consolidation 2,600 9,800
Multi-seller conduits | Commercial and other    
Variable Interest Entity [Line Items]    
Unfunded lending-related commitments $ 12,600 $ 10,800