Finance Receivables - Finance Receivables, Net (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan losses	$ (2,344)	$ (2,096)
Finance receivables, net	84,637	74,514
Retail Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net of fees	72,729	65,322
Less: allowance for loan losses	(2,308)	(2,062)	$ (1,839)	$ (1,915)
Finance receivables, net	70,421	63,260
Commercial Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net of fees	14,251	11,288
Less: allowance for loan losses	(36)	(34)
Finance receivables, net	14,216	11,254
Dealer cash management balances	2,600	1,900
Commercial Finance Receivables | Dealer Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net of fees	13,422	10,812
Commercial Finance Receivables | Other Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net of fees	830	476
Level 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	14,216	11,254
Level 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	$ 70,911	$ 62,150