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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
GM Financial receivables	$ 92,558		$ 92,558		$ 95,294
Common stock dividends declared and paid	350	$ 450	1,100	$ 1,400
Commercial Finance Receivables
Related Party Transaction [Line Items]
GM Financial receivables	16,700		16,700		19,228
Eliminations
Related Party Transaction [Line Items]
Subvention receivable from GM	544		544		360
Interest subvention earned on finance receivables	344	345	1,075	1,026
Leased vehicle subvention earned	461	385	1,313	1,108
Cash payments	856	$ 1,200	2,500	$ 2,900
Eliminations | Commercial Finance Receivables
Related Party Transaction [Line Items]
GM Financial receivables	381		381		279
Commercial loan funding payable to GM	$ 102		$ 102		$ 100

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