GM Financial Receivables and Transactions - Credit Risk Profile by FICO Score (Details) - GM Financial - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 92,759	$ 86,463
Retail Finance Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2024	23,078	30,253
2023	22,487	20,259
2022	14,553	12,670
2021	8,793	6,842
2020	4,291	2,000
Prior	1,181	707
Total	$ 74,384	$ 72,729	$ 71,704
Percent	100.00%	100.00%
Prime – FICO score 680 and greater | Retail Finance Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 17,609	$ 23,940
2023	17,704	15,581
2022	11,118	9,039
2021	6,255	4,926
2020	3,084	1,076
Prior	544	320
Total	$ 56,315	$ 54,882
Percent	75.70%	75.50%
Near-prime – FICO score 620 to 679 | Retail Finance Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 2,717	$ 3,234
2023	2,457	2,281
2022	1,678	1,746
2021	1,227	906
2020	568	350
Prior	218	129
Total	$ 8,864	$ 8,647
Percent	11.90%	11.90%
Sub-prime – FICO score less than 620 | Retail Finance Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 2,752	$ 3,079
2023	2,326	2,397
2022	1,758	1,884
2021	1,311	1,010
2020	639	573
Prior	419	257
Total	$ 9,205	$ 9,200
Percent	12.40%	12.60%