Transfers of Receivables - Exposure Based on Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Securitization Transactions [Line Items]
Fair Value of Derivative Assets	$ 784	$ 818
Fair Value of Derivative Liabilities	1,992	2,141
Securitization Transactions [Member]
Securitization Transactions [Line Items]
Fair Value of Derivative Assets	102	187
Fair Value of Derivative Liabilities	159	122
Related to Variable Interest Entity - Not VIE [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Fair Value of Derivative Assets	29	7
Fair Value of Derivative Liabilities	32	48
Other, Not Variable Interest Entity Related [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Fair Value of Derivative Assets	39	90
Fair Value of Derivative Liabilities	27	29
Variable Interest Entity, Primary Beneficiary [Member]
Securitization Transactions [Line Items]
Fair Value of Derivative Assets	34	90
Fair Value of Derivative Liabilities	100	45
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Fair Value of Derivative Assets	34	90
Fair Value of Derivative Liabilities	$ 100	$ 45