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Restructuring And Other Initiatives (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at beginning of period | $ 564 | $ 1,122 | $ 227 | $ 268
Additions, interest accretion and other |  | 629 | 1,637 | 330
Payments |  | (1,101) | (600) | (315)
Revisions to estimates and effect of foreign currency |  | (86) | (142) | (56)
Balance at end of period |  | 564 | 1,122 | 227
GMI | Separation Programs in South Africa and India |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring charges and other charges |  |  |  | 460
GMI | Separation Programs in Australia, Korea, South Africa, India and Chevrolet Europe |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring cost incurred to date |  |  |  | 892
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Payments |  | (1,100) |  |
Restructuring cost incurred to date |  | 3,100 |  |
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs | GMNA |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring charges and other charges |  | 1,800 | 1,300 |
Employee Severance | GMNA |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring charges and other charges |  |  | 1,000 |
Non-cash Accelerated Depreciation | GMNA |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring charges and other charges |  | 1,300 | 301 |
Supplier Related Charges and Employee Separation Charges | GMNA |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring charges and other charges |  | $ 535 |  |
Facility closing | GMI | Gunsan Korea Plant |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring charges and other charges |  |  | 1,000 |
Severance Costs |  |  | 495 |
Non-cash Asset Impairments and Other Charges | GMI | Gunsan Korea Plant |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring charges and other charges |  |  | 537 |
Employee Severance and Statutory Pension Payments | GMI | Gunsan Korea Plant |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Payments |  |  | $ (775) |
Asset Impairments, Sales Incentives, Inventory Provisions and Other Restructuring Costs | GMI | Separation Programs in South Africa and India |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring charges and other charges |  |  |  | 297
Dealer Restructuring, Employee Severance and Contract Termination Costs | GMI | Separation Programs in South Africa and India |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring charges and other charges |  |  |  | $ 163
Forecast | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs | GMNA |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Expected amount of cash flows | $ 400 |  |  |

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