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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 24, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
GM Financial [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Financing receivable, net |  | $ 53,760 |  | $ 53,760 |  | $ 51,933
GM Financial [Member] | Subsequent Event [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Common stock dividends declared | $ 400 |  |  |  |  |
GM Financial [Member] | Commercial Finance Receivables [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Financing receivable, net |  | 12,719 |  | 12,719 |  | 12,209
GM Financial [Member] | Retail Finance Receivables [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Financing receivable, net |  | 41,041 |  | 41,041 |  | 39,724
Intersegment Eliminations [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cash payments to GM Financial |  | 1,000 | $ 1,100 | 3,100 | $ 2,800 |
Intersegment Eliminations [Member] | GM Financial [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Subvention receivable |  | 692 |  | 692 |  | 727
Interest subvention earned on finance receivables |  | 153 | 142 | 448 | 409 |
Leased vehicle subvention earned |  | 814 | $ 827 | 2,467 | $ 2,438 |
Intersegment Eliminations [Member] | GM Financial [Member] | Commercial Finance Receivables [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Financing receivable, net |  | 502 |  | 502 |  | 445
Commercial loan funding payable |  | 61 |  | 61 |  | 61
Intersegment Eliminations [Member] | GM Financial [Member] | Retail Finance Receivables [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Financing receivable, net |  | $ 70 |  | $ 70 |  | $ 134

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