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Variable Interest Entities - Multi-seller conduits (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Variable Interest Entity [Line Items]    
Unfunded lending-related commitments $ 1,855,174 $ 1,817,307
Multi-seller conduits    
Variable Interest Entity [Line Items]    
Commercial paper eliminated in consolidation 2,200 2,200
Multi-seller conduits | Commercial and other    
Variable Interest Entity [Line Items]    
Unfunded lending-related commitments $ 10,500 $ 9,900