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Automotive and GM Financial Debt (Tables) | 9 Months Ended
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Sep. 30, 2018
Automotive [Member] |
Debt Instrument [Line Items] |
Debt carrying amount and fair value |
| September 30, 2018 |  | December 31, 2017
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Total automotive debt | $ | 15,963 |  |  | $ | 16,352 |  |  | $ | 13,502 |  |  | $ | 15,088 |
Fair value utilizing Level 1 inputs |  |  | $ | 13,971 |  |  |  |  | $ | 13,202 |
Fair value utilizing Level 2 inputs |  |  | $ | 2,381 |  |  |  |  | $ | 1,886 |
GM Financial [Member] |
Debt Instrument [Line Items] |
Debt carrying amount and fair value |
| September 30, 2018 |  | December 31, 2017
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Secured debt | $ | 39,722 |  |  | $ | 39,679 |  |  | $ | 39,887 |  |  | $ | 39,948 |
Unsecured debt | 46,655 |  |  | 47,062 |  |  | 40,830 |  |  | 41,989 |
Total GM Financial debt | $ | 86,377 |  |  | $ | 86,741 |  |  | $ | 80,717 |  |  | $ | 81,937 |
Fair value utilizing Level 2 inputs |  |  | $ | 84,693 |  |  |  |  |  | $ | 79,623 |
Fair value utilizing Level 3 inputs |  |  | $ | 2,048 |  |  |  |  |  | $ | 2,314 |

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