Finance Receivables - Schedule of Credit Risk Profile by Dealer (Details) - Commercial Finance Receivables - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 14,895	$ 14,251
Dealer Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	12,682	11,971
2024	68	296
2023	271	435
2022	425	311
2021	302	301
2020	294	96
Prior	79	11
Total	$ 14,122	$ 13,422
Percent	100.00%	100.00%
Floorplan Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of revolving balance	99.10%	99.70%
Group I - Performing accounts with strong to acceptable financial metrics | Dealer Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 12,192	$ 11,638
2024	64	295
2023	263	417
2022	403	297
2021	289	301
2020	294	85
Prior	72	11
Total	$ 13,578	$ 13,043
Percent	96.10%	97.20%
Group II - Performing accounts experiencing potential weakness in financial metrics | Dealer Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 274	$ 182
2024	0	0
2023	3	2
2022	7	2
2021	0	0
2020	0	0
Prior	0	0
Total	$ 284	$ 187
Percent	2.00%	1.40%
Group III - Non-Performing accounts with inadequate paying capacity for current obligations | Dealer Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 217	$ 152
2024	4	1
2023	5	15
2022	15	12
2021	12	0
2020	0	11
Prior	7	0
Total	$ 261	$ 192
Percent	1.80%	1.40%
Group IV - Non-Performing accounts with inadequate paying capacity for current obligations and inherent weaknesses | Dealer Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 0	$ 0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Total	$ 0	$ 0
Percent	0.00%	0.00%