Variable Interest Entities - Multi-seller Conduits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Off-balance sheet lending-related financial commitments, contractual amount	$ 1,497,847	$ 1,326,782
Firm-administered multi-seller conduits
Variable Interest Entity [Line Items]
Commercial paper eliminated in consolidation	9,800	13,800
Firm-administered multi-seller conduits | Commercial and other
Variable Interest Entity [Line Items]
Off-balance sheet lending-related financial commitments, contractual amount	$ 10,800	$ 10,600
Maximum
Variable Interest Entity [Line Items]
Program-wide credit enhancement required amount	10.00%