GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
GM Financial receivables	$ 92,189		$ 92,189		$ 92,374
Common stock dividends declared and paid	250	$ 350	900	$ 700
Commercial Finance Receivables
Related Party Transaction [Line Items]
GM Financial receivables	16,126		16,126		16,970
Eliminations
Related Party Transaction [Line Items]
Subvention receivable from GM	494		494		452
Interest subvention earned on finance receivables	297	364	607	731
Leased vehicle subvention earned	482	437	967	852
Cash payments	690	$ 918	1,300	$ 1,600
Eliminations \| Commercial Finance Receivables
Related Party Transaction [Line Items]
GM Financial receivables	393		393		395
Commercial loan funding payable to GM	$ 114		$ 114		$ 94

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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