GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
GM Financial receivables	$ 94,326		$ 94,326		$ 92,374
Common stock dividends declared and paid	250	$ 350	1,200	$ 1,100
Commercial Finance Receivables
Related Party Transaction [Line Items]
GM Financial receivables	17,675		17,675		16,970
Eliminations
Related Party Transaction [Line Items]
Subvention receivable from GM	501		501		452
Interest subvention earned on finance receivables	298	344	905	1,075
Leased vehicle subvention earned	469	461	1,436	1,313
Cash payments	796	$ 856	2,100	$ 2,500
Eliminations \| Commercial Finance Receivables
Related Party Transaction [Line Items]
GM Financial receivables	349		349		395
Commercial loan funding payable to GM	$ 118		$ 118		$ 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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