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Variable Interest Entities - Multi-seller conduits (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Unfunded lending-related commitments $ 1,301,618 $ 1,262,313
Multi-seller conduits    
Variable Interest Entity [Line Items]    
Commercial paper eliminated in consolidation 13,300 13,700
Multi-seller conduits | Commercial and other    
Variable Interest Entity [Line Items]    
Unfunded lending-related commitments $ 13,800 $ 13,400