GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Related Party Transactions [Line Items] | |||
| Financing receivable, net | $ 57,992 | $ 52,956 | |
| Common stock dividends declared | 800 | 400 | $ 375 |
| Commercial Portfolio Segment | |||
| Related Party Transactions [Line Items] | |||
| Financing receivable, net | 8,619 | 11,593 | |
| Eliminations/ Reclassifications | |||
| Related Party Transactions [Line Items] | |||
| Subvention receivable | 642 | 676 | |
| Interest subvention earned on finance receivables | 679 | 588 | 554 |
| Leased vehicle subvention earned | 3,042 | 3,273 | 3,274 |
| Cash payments to GM Financial | 3,900 | 4,100 | $ 3,800 |
| Eliminations/ Reclassifications | Commercial Portfolio Segment | |||
| Related Party Transactions [Line Items] | |||
| Financing receivable, net | 398 | 478 | |
| Commercial loan funding payable | $ 23 | $ 74 | |