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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 274 | $ 493 | $ 227 | $ 268 |
Additions, interest accretion and other | 8 | 43 | 600 | 333 |
Payments | (72) | (75) | (567) | (150) |
Revisions to estimates and effect of foreign currency | (3) | (7) | (53) | 3 |
Balance at end of period | $ 207 | 454 | 207 | 454 |
Gunsan Korea Plant [Member] | Facility Closing [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Termination benefits |  |  | 495 |  |
Gunsan Korea Plant [Member] | Non-cash Asset Impairments and Other Charges [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Pre-tax restructuring costs |  |  | 537 |  |
Gunsan Korea Plant [Member] | Employee Severance and Statutory Pension Payments [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Payments |  |  | (748) |  |
GMI [Member] | Gunsan Korea Plant [Member] | Facility Closing [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Pre-tax restructuring costs |  |  | $ 1,000 |  |
GMI [Member] | Separation Programs In South Africa And India [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Pre-tax restructuring costs |  |  |  | 460 |
GMI [Member] | Separation Programs In South Africa And India [Member] | Asset Impairments, Sales Incentives, Inventory Provisions and Other Restructuring Costs [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Pre-tax restructuring costs |  |  |  | 297 |
GMI [Member] | Separation Programs In South Africa And India [Member] | Dealer Restructuring, Employee Severance and Contract Termination Costs [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Pre-tax restructuring costs |  |  |  | 163 |
GMI [Member] | Separation Programs in Australia, Korea, South Africa, India and Chevrolet Europe [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Total cost incurred to date |  | $ 883 |  | $ 883 | $ 892

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