Finance Receivables - Credit Risk Profile by Dealer (Details) - Commercial Finance Receivables - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 6,165	$ 5,590
2022	129	446
2021	424	457
2020	432	145
2019	126	58
2018	52	62
Prior	67	14
Total	$ 7,395	$ 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	$ 5,898	$ 5,296
2022	129	433
2021	417	426
2020	416	131
2019	113	57
2018	51	50
Prior	56	10
Total	$ 7,081	$ 6,403
Percent of portfolio	95.70%	94.60%
Group II - Performing accounts experiencing potential weakness in financial metrics
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 209	$ 213
2022	0	5
2021	7	16
2020	16	12
2019	13	1
2018	0	10
Prior	10	0
Total	$ 254	$ 257
Percent of portfolio	3.40%	3.80%
Group III - Non-Performing accounts with inadequate paying capacity for current obligations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 58	$ 81
2022	0	8
2021	0	15
2020	0	2
2019	1	0
2018	0	2
Prior	1	4
Total	$ 60	$ 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%