Finance Receivables - Credit Risk Profile by Dealer (Details) - Commercial Finance Receivables - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 6,273	$ 5,590
2022	368	446
2021	400	457
2020	406	145
2019	123	58
2018	49	62
Prior	47	14
Total	$ 7,666	$ 6,772
Percent of portfolio	100.00%	100.00%
Floorplan Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of revolving balance	93.00%	94.00%
Group I - Performing accounts with strong to acceptable financial metrics
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 6,024	$ 5,296
2022	353	433
2021	395	426
2020	406	131
2019	110	57
2018	49	50
Prior	38	10
Total	$ 7,374	$ 6,403
Percent of portfolio	96.20%	94.60%
Group II - Performing accounts experiencing potential weakness in financial metrics
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 190	$ 213
2022	15	5
2021	3	16
2020	0	12
2019	12	1
2018	0	10
Prior	8	0
Total	$ 229	$ 257
Percent of portfolio	3.00%	3.80%
Group III - Non-Performing accounts with inadequate paying capacity for current obligations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 59	$ 81
2022	1	8
2021	2	15
2020	0	2
2019	1	0
2018	0	2
Prior	0	4
Total	$ 63	$ 112
Percent of portfolio	0.80%	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%