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Variable Interest Entities - Multi-seller conduits (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Variable Interest Entity [Line Items]      
Unfunded lending-related commitments $ 1,045,993 $ 991,482 $ 996,634
Multi-seller conduits      
Variable Interest Entity [Line Items]      
Commercial paper eliminated in consolidation 20,500 20,400  
Multi-seller conduits | Commercial and other      
Variable Interest Entity [Line Items]      
Unfunded lending-related commitments $ 9,700 $ 8,800