Finance Receivables - Schedule of Financing Receivable Credit Quality Indicators (Details) - Retail Finance Receivables - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
2025	$ 24,333	$ 31,101
2024	22,431	20,100
2023	13,900	12,802
2022	8,397	7,642
2021	4,704	3,575
Prior	2,093	847
Total	$ 75,857	$ 76,066	$ 74,384
Percent	100.00%	100.00%
Prime - FICO Score 680 and greater
Financing Receivable, Credit Quality Indicator [Line Items]
2025	$ 18,457	$ 24,155
2024	16,962	15,814
2023	10,727	9,749
2022	6,263	5,424
2021	3,293	2,559
Prior	1,376	366
Total	$ 57,078	$ 58,067
Percent	75.20%	76.30%
Near-prime - FICO Score 620 to 679
Financing Receivable, Credit Quality Indicator [Line Items]
2025	$ 2,927	$ 3,547
2024	2,712	2,227
2023	1,619	1,507
2022	1,044	1,077
2021	681	473
Prior	300	159
Total	$ 9,282	$ 8,990
Percent	12.20%	11.80%
Sub-prime - FICO Score less than 620
Financing Receivable, Credit Quality Indicator [Line Items]
2025	$ 2,948	$ 3,399
2024	2,758	2,059
2023	1,554	1,546
2022	1,090	1,141
2021	730	543
Prior	418	322
Total	$ 9,497	$ 9,008
Percent	12.50%	11.80%