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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
GM Financial receivables	$ 94,236		$ 94,236		$ 95,294
Common stock dividends declared and paid	350	$ 450	700	$ 900
Commercial Finance Receivables
Related Party Transaction [Line Items]
GM Financial receivables	16,399		16,399		19,228
Eliminations
Related Party Transaction [Line Items]
Subvention receivable from GM	579		579		360
Interest subvention earned on finance receivables	364	346	731	680
Leased vehicle subvention earned	437	359	852	723
Cash payments	918	$ 934	1,600	$ 1,700
Eliminations | Commercial Finance Receivables
Related Party Transaction [Line Items]
GM Financial receivables	324		324		279
Commercial loan funding payable to GM	$ 101		$ 101		$ 100

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