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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |
Financing receivable, net | $ 54,753 |  | $ 54,753 |  | $ 52,956
Common stock dividends declared and paid |  |  | 800 |  |
Commercial Finance Receivables [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Financing receivable, net | 7,995 |  | 7,995 |  | 11,593
Intersegment Eliminations [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Subvention receivable | 566 |  | 566 |  | 676
Interest subvention earned on finance receivables | 178 | $ 153 | 496 | $ 448 |
Leased vehicle subvention earned | 749 | 814 | 2,319 | 2,467 |
Cash payments | 943 | $ 1,000 | 3,000 | $ 3,100 |
Intersegment Eliminations [Member] | Commercial Finance Receivables [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Financing receivable, net | 399 |  | 399 |  | 478
Commercial loan funding payable | $ 75 |  | $ 75 |  | $ 74

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