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Automotive and GM Financial Debt (Tables) | 6 Months Ended
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Jun. 30, 2018
Automotive [Member] |
Debt Instrument [Line Items] |
Debt carrying amount and fair value |
| June 30, 2018 |  | December 31, 2017
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Total automotive debt | $ | 13,819 |  |  | $ | 14,362 |  |  | $ | 13,502 |  |  | $ | 15,088 |
Fair value utilizing Level 1 inputs |  |  | $ | 12,042 |  |  |  |  | $ | 13,202 |
Fair value utilizing Level 2 inputs |  |  | $ | 2,320 |  |  |  |  | $ | 1,886 |
GM Financial [Member] |
Debt Instrument [Line Items] |
Debt carrying amount and fair value |
| June 30, 2018 |  | December 31, 2017
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Secured debt | $ | 39,083 |  |  | $ | 39,024 |  |  | $ | 39,887 |  |  | $ | 39,948 |
Unsecured debt | 45,357 |  |  | 45,845 |  |  | 40,830 |  |  | 41,989 |
Total GM Financial debt | $ | 84,440 |  |  | $ | 84,869 |  |  | $ | 80,717 |  |  | $ | 81,937 |
Fair value utilizing Level 2 inputs |  |  | $ | 82,604 |  |  |  |  |  | $ | 79,623 |
Fair value utilizing Level 3 inputs |  |  | $ | 2,265 |  |  |  |  |  | $ | 2,314 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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