Finance Receivables - Credit Risk Profile by Dealer Grouping of Commercial Finance Receivables (Details) - Commercial Finance Receivables - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 14,251	$ 11,288
Dealer Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	11,971	9,428
2023	296	468
2022	435	363
2021	311	372
2020	301	112
2019	96	45
Prior	11	25
Total	$ 13,422	$ 10,812
Percent	100.00%	100.00%
Dealer Financing | I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 11,638	$ 9,261
2023	295	452
2022	417	361
2021	297	372
2020	301	102
2019	85	45
Prior	11	24
Total	$ 13,043	$ 10,618
Percent	97.20%	98.20%
Dealer Financing | II
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 182	$ 89
2023	0	0
2022	2	1
2021	2	0
2020	0	0
2019	0	0
Prior	0	0
Total	$ 187	$ 91
Percent	1.40%	0.80%
Dealer Financing | III
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving	$ 152	$ 78
2023	1	15
2022	15	0
2021	12	0
2020	0	10
2019	11	0
Prior	0	0
Total	$ 192	$ 104
Percent	1.40%	1.00%
Dealer Financing | IV
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%