Transfers of Receivables - Interest Expense on Securitization Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Securitization Transactions [Line Items]
Interest expense	$ 7,583	$ 6,311	$ 3,334
Securitization Transactions [Member]
Securitization Transactions [Line Items]
Interest expense	2,775	2,463	1,276
Securitization Transactions [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Securitization Transactions [Line Items]
Interest expense	610	591	267
Securitization Transactions [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Securitization Transactions [Line Items]
Interest expense	$ 2,165	$ 1,872	$ 1,009