GM Financial Receivables and Transactions - Credit Risk Profile by FICO Score (Details) - GM Financial - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 89,841	$ 86,463
Retail Finance Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2024	15,450	30,253
2023	24,854	20,259
2022	16,350	12,670
2021	10,007	6,842
2020	5,073	2,000
Prior	1,602	707
Total	$ 73,335	$ 72,729	$ 69,722
Percent	100.00%	100.00%
Retail Finance Receivables | Prime – FICO score 680 and greater
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 11,725	$ 23,940
2023	19,600	15,581
2022	12,532	9,039
2021	7,131	4,926
2020	3,651	1,076
Prior	772	320
Total	$ 55,411	$ 54,882
Percent	75.60%	75.50%
Retail Finance Receivables | Near-prime – FICO score 620 to 679
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 1,817	$ 3,234
2023	2,701	2,281
2022	1,867	1,746
2021	1,389	906
2020	670	350
Prior	291	129
Total	$ 8,736	$ 8,647
Percent	11.90%	11.90%
Retail Finance Receivables | Sub-prime – FICO score less than 620
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 1,908	$ 3,079
2023	2,553	2,397
2022	1,951	1,884
2021	1,487	1,010
2020	752	573
Prior	539	257
Total	$ 9,188	$ 9,200
Percent	12.50%	12.60%