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Segment Reporting - Revenues and long-lived assets by geographic region (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Automotive net sales and revenue |  |  |  |  |  |  |  |  | $ 122,697 | $ 133,045 |
GM Financial net sales and revenue |  |  |  |  |  |  |  |  | 14,540 | 14,004 |
Total net sales and revenue | $ 30,826 | $ 35,473 | $ 36,060 | $ 34,878 | $ 38,399 | $ 35,791 | $ 36,760 | $ 36,099 | 137,237 | 147,049 | $ 145,588
Long-Lived Assets | 80,872 |  |  |  | 82,698 |  |  |  | 80,872 | 82,698 | 80,329
Automotive |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Automotive net sales and revenue |  |  |  |  |  |  |  |  | 122,697 | 133,045 | 133,449
Automotive | U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Automotive net sales and revenue |  |  |  |  |  |  |  |  | 97,887 | 104,413 | 100,674
Long-Lived Assets | 25,401 |  |  |  | 25,625 |  |  |  | 25,401 | 25,625 | 24,473
Automotive | Non-U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Automotive net sales and revenue |  |  |  |  |  |  |  |  | 24,810 | 28,632 | 32,775
Long-Lived Assets | 13,190 |  |  |  | 13,263 |  |  |  | 13,190 | 13,263 | 12,715
GM Financial |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales and revenue |  |  |  |  |  |  |  |  | 14,540 | 14,004 | 12,139
GM Financial | U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
GM Financial net sales and revenue |  |  |  |  |  |  |  |  | 12,727 | 12,169 | 10,489
Long-Lived Assets | 39,509 |  |  |  | 41,334 |  |  |  | 39,509 | 41,334 | 40,674
GM Financial | Non-U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
GM Financial net sales and revenue |  |  |  |  |  |  |  |  | 1,813 | 1,835 | 1,650
Long-Lived Assets | $ 2,772 |  |  |  | $ 2,476 |  |  |  | $ 2,772 | $ 2,476 | $ 2,467

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