Finance Receivables - Finance Receivables, Net (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan losses	$ (2,458)	$ (2,344)
Finance receivables, net	93,510	84,637
Retail Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	76,066	72,729
Less: allowance for loan losses	(2,400)	(2,308)	$ (2,062)	$ (1,839)
Finance receivables, net	73,667	70,421
Commercial Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	19,901	14,251
Less: allowance for loan losses	(58)	(36)
Finance receivables, net	19,843	14,216
Dealer cash management balances	3,400	2,600
Commercial Finance Receivables | Dealer Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	18,902	13,422
Commercial Finance Receivables | Other Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	999	830
Level 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	19,843	14,216
Level 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	$ 74,729	$ 70,911