Finance Receivables - Schedule of Financing Receivable Credit Quality Indicators (Details) - Retail Finance Receivables - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 7,993	$ 30,253
2023	27,542	20,259
2022	18,308	12,670
2021	11,329	6,842
2020	5,938	2,000
Prior	2,120	707
Total	$ 73,230	$ 72,729	$ 67,704
Percent	100.00%	100.00%
Prime - FICO Score 680 and greater
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 6,124	$ 23,940
2023	21,739	15,581
2022	14,060	9,039
2021	8,080	4,926
2020	4,274	1,076
Prior	1,055	320
Total	$ 55,332	$ 54,882
Percent	75.60%	75.50%
Near-prime - FICO Score 620 to 679
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 902	$ 3,234
2023	2,981	2,281
2022	2,076	1,746
2021	1,566	906
2020	787	350
Prior	380	129
Total	$ 8,692	$ 8,647
Percent	11.90%	11.90%
Sub-prime - FICO Score less than 620
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 967	$ 3,079
2023	2,821	2,397
2022	2,172	1,884
2021	1,682	1,010
2020	878	573
Prior	685	257
Total	$ 9,206	$ 9,200
Percent	12.60%	12.60%