Finance Receivables - Credit Risk Profile by Dealer Grouping of Commercial Finance Receivables (Details) - Commercial Finance Receivables - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 19,901	$ 14,251
Dealer Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	17,356	11,971
2024	360	296
2023	225	435
2022	385	311
2021	263	301
2020	269	96
Prior	44	11
Total	$ 18,902	$ 13,422
Percent	100.00%	100.00%
Dealer Financing | I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 16,429	$ 11,638
2024	350	295
2023	211	417
2022	360	297
2021	237	301
2020	267	85
Prior	32	11
Total	$ 17,885	$ 13,043
Percent	94.60%	97.20%
Dealer Financing | II
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 621	$ 182
2024	0	0
2023	10	2
2022	26	2
2021	3	0
2020	2	0
Prior	0	0
Total	$ 663	$ 187
Percent	3.50%	1.40%
Dealer Financing | III
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 305	$ 152
2024	10	1
2023	4	15
2022	0	12
2021	22	0
2020	0	11
Prior	12	0
Total	$ 354	$ 192
Percent	1.90%	1.40%
Dealer Financing | IV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 1	$ 0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Total	$ 1	$ 0
Percent	0.00%	0.00%