Finance Receivables - Credit Risk Profile by Dealer (Details) - Commercial Finance Receivables - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 8,039	$ 5,590
2022	485	446
2021	378	457
2020	378	145
2019	116	58
2018	48	62
Prior	27	14
Total	$ 9,471	$ 6,772
Percent of portfolio	100.00%	100.00%
Floorplan Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of revolving balance	94.00%	94.00%
Group I - Performing accounts with strong to acceptable financial metrics
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 7,790	$ 5,296
2022	470	433
2021	373	426
2020	378	131
2019	104	57
2018	47	50
Prior	26	10
Total	$ 9,189	$ 6,403
Percent of portfolio	97.00%	94.60%
Group II - Performing accounts experiencing potential weakness in financial metrics
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 199	$ 213
2022	15	5
2021	4	16
2020	0	12
2019	7	1
2018	0	10
Prior	0	0
Total	$ 226	$ 257
Percent of portfolio	2.40%	3.80%
Group III - Non-Performing accounts with inadequate paying capacity for current obligations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 50	$ 81
2022	0	8
2021	0	15
2020	0	2
2019	5	0
2018	0	2
Prior	0	4
Total	$ 55	$ 112
Percent of portfolio	0.60%	1.60%
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
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Total	$ 0	$ 0
Percent of portfolio	0.00%	0.00%