Finance Receivables - Credit Risk Profile by Dealer (Details) - Commercial Finance Receivables - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 10,545	$ 9,791
2023	320	581
2022	559	363
2021	320	372
2020	322	112
2019	102	45
Prior	36	25
Total	$ 12,204	$ 11,288
Percent	100.00%	100.00%
Floorplan Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of revolving balance	95.00%	97.00%
Group I - Performing accounts with strong to acceptable financial metrics
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 10,252	$ 9,624
2023	320	566
2022	541	361
2021	309	372
2020	321	102
2019	94	45
Prior	36	24
Total	$ 11,874	$ 11,094
Percent	97.30%	98.30%
Group II - Performing accounts experiencing potential weakness in financial metrics
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 142	$ 89
2023	0	0
2022	2	1
2021	1	0
2020	0	0
2019	0	0
Prior	0	0
Total	$ 146	$ 91
Percent	1.20%	0.80%
Group III - Non-Performing accounts with inadequate paying capacity for current obligations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 150	$ 78
2023	0	15
2022	16	0
2021	9	0
2020	0	10
2019	8	0
Prior	0	0
Total	$ 184	$ 104
Percent	1.60%	0.90%
Group IV - Non-Performing accounts with inadequate paying capacity for current obligations and inherent weaknesses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 0	$ 0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Total	$ 0	$ 0
Percent	0.00%	0.00%