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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
GM Financial receivables	$ 92,759		$ 92,759		$ 86,463
Common stock dividends declared and paid	450	$ 450	1,400	$ 1,400
Commercial Finance Receivables
Related Party Transaction [Line Items]
GM Financial receivables	18,375		18,375		13,734
Eliminations
Related Party Transaction [Line Items]
Subvention receivable from GM	350		350		508
Interest subvention earned on finance receivables	345	319	1,026	906
Leased vehicle subvention earned	385	382	1,108	1,165
Cash payments	1,200	$ 629	2,900	$ 2,300
Eliminations | Commercial Finance Receivables
Related Party Transaction [Line Items]
GM Financial receivables	208		208		164
Commercial loan funding payable to GM	96		96		55
Eliminations | Commercial Finance Receivables | Cruise
Related Party Transaction [Line Items]
GM Financial receivables	$ 395		$ 395		$ 353

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