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Product Warranty and Related Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2018
Product Warranties Disclosures [Abstract] |
Schedule of policy, product warranty and recall campaigns |
| Three Months Ended |  | Nine Months Ended
| September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
Warranty balance at beginning of period | $ | 7,990 |  |  | $ | 8,890 |  |  | $ | 8,332 |  |  | $ | 9,069 |
Warranties issued and assumed in period – recall campaigns | 101 |  |  | 173 |  |  | 515 |  |  | 527 |
Warranties issued and assumed in period – product warranty | 542 |  |  | 481 |  |  | 1,599 |  |  | 1,586 |
Payments | (723 | ) |  | (787 | ) |  | (2,175 | ) |  | (2,382 | )
Adjustments to pre-existing warranties | (209 | ) |  | (317 | ) |  | (426 | ) |  | (405 | )
Effect of foreign currency and other | (8 | ) |  | 39 |  |  | (152 | ) |  | 84 |
Warranty balance at end of period | $ | 7,693 |  |  | $ | 8,479 |  |  | $ | 7,693 |  |  | $ | 8,479 |

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- Definition Table which summarizes the activity for policy, product warranty and recall campaigns for reporting periods. + References No definition available. + Details
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Namespace Prefix: | gm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration