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Automotive and GM Financial Debt Interest Expense and LT Debt Maturities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Total interest expense | $ 3,880 | $ 3,141 | $ 2,535
2019 | 31,994 |  |
2020 | 23,742 |  |
2021 | 15,543 |  |
2022 | 7,479 |  |
2023 | 6,627 |  |
Thereafter | 20,763 |  |
Total | 106,148 |  |
Automotive [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total interest expense | 655 | 575 | 563
2019 | 949 |  |
2020 | 589 |  |
2021 | 505 |  |
2022 | 49 |  |
2023 | 1,544 |  |
Thereafter | 10,826 |  |
Total | 14,462 |  |
Future interest payments on capital lease obligations | 565 |  |
GM Financial [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Financing interest expense | 3,225 | $ 2,566 | $ 1,972
2019 | 31,045 |  |
2020 | 23,153 |  |
2021 | 15,038 |  |
2022 | 7,430 |  |
2023 | 5,083 |  |
Thereafter | 9,937 |  |
Total | $ 91,686 |  |

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