Transfers of Receivables - Derivative Income and Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative expense/(income) related to securitization transactions [Abstract]
Derivative expense/(income)	$ 647	$ 521	$ 392
Securitization Transactions [Member]
Derivative expense/(income) related to securitization transactions [Abstract]
Derivative expense/(income)	(56)	(39)	(466)
Securitization Transactions [Member] | Related to Variable Interest Entity - Not VIE [Member]
Derivative expense/(income) related to securitization transactions [Abstract]
Derivative expense/(income)	12	(38)	120
Securitization Transactions [Member] | Other, Not Variable Interest Entity Related [Member]
Derivative expense/(income) related to securitization transactions [Abstract]
Derivative expense/(income)	(82)	(26)	(259)
Securitization Transactions [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Derivative expense/(income) related to securitization transactions [Abstract]
Derivative expense/(income)	$ 14	$ 25	$ (327)