Finance Receivables - Credit Risk Profile by Dealer (Details) - Commercial Finance Receivables - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 9,089	$ 9,791
2023	116	581
2022	578	363
2021	343	372
2020	345	112
2019	108	45
Prior	49	25
Total	$ 10,627	$ 11,288
Percent	100.00%	100.00%
Floorplan Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of revolving balance	96.00%	97.00%
Group I - Performing accounts with strong to acceptable financial metrics
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 8,936	$ 9,624
2023	116	566
2022	562	361
2021	341	372
2020	345	102
2019	98	45
Prior	49	24
Total	$ 10,446	$ 11,094
Percent	98.30%	98.30%
Group II - Performing accounts experiencing potential weakness in financial metrics
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 94	$ 89
2023	0	0
2022	0	1
2021	1	0
2020	0	0
2019	0	0
Prior	0	0
Total	$ 96	$ 91
Percent	0.90%	0.80%
Group III - Non-Performing accounts with inadequate paying capacity for current obligations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 59	$ 78
2023	0	15
2022	15	0
2021	0	0
2020	0	10
2019	10	0
Prior	0	0
Total	$ 84	$ 104
Percent	0.80%	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%