GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transactions [Line Items]
Financing receivable	$ 92,374	$ 95,294
Common stock dividends declared and paid	1,500	1,800	$ 1,800
Commercial Portfolio Segment
Related Party Transactions [Line Items]
Financing receivable	16,970	19,228
Eliminations/ Reclassifications
Related Party Transactions [Line Items]
Subvention receivable from GM	452	360
Interest subvention earned on finance receivables	1,404	1,385	1,234
Leased vehicle subvention earned	1,796	1,511	1,537
Cash payments	3,300	3,800	$ 3,500
Eliminations/ Reclassifications \| Commercial Portfolio Segment
Related Party Transactions [Line Items]
Financing receivable	395	279
Commercial loan funding payable to GM	94	100
Eliminations/ Reclassifications \| Commercial Portfolio Segment \| Cruise
Related Party Transactions [Line Items]
Financing receivable	$ 0	$ 395

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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