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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2019
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | $ 919 | $ 274 | $ 1,122 | $ 227 |  | $ 227 |
Additions, interest accretion and other | 211 | 8 | 499 | 600 |  |  |
Payments | (162) | (72) | (645) | (567) |  |  |
Revisions to estimates and effect of foreign currency | (30) | (3) | (38) | (53) |  |  |
Balance at end of period | 938 | $ 207 | 938 | 207 |  | 1,122 |
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  | (645) |  |  |  |
Cost since inception | 2,900 |  | 2,900 |  |  |  |
GMNA [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges | 390 |  | 1,500 |  |  |  |
GMNA [Member] | Pension Curtailment and Other Charges [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges | 209 |  |  |  |  |  |
GMNA [Member] | Supplier-related Charges [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges | $ 181 |  | 421 |  |  |  |
GMNA [Member] | Non-cash Accelerated Depreciation [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges |  |  | $ 1,100 |  |  |  |
GMI [Member] | Korea [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges |  |  |  | 1,000 |  |  |
GMI [Member] | Korea [Member] | Non-cash Asset Impairments [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges |  |  |  | 537 |  |  |
GMI [Member] | Korea [Member] | Employee Separation Charges [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges |  |  |  | 495 |  |  |
GMI [Member] | Korea [Member] | Employee Severance and Statutory Pension Payments [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  |  | $ (748) |  | $ (775) |
Forecast [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Expected amount of cash flows |  |  |  |  | $ 900 |  |
Forecast [Member] | Minimum [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Expected costs |  |  |  |  |  |  | $ 100
Forecast [Member] | Maximum [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Expected costs |  |  |  |  |  |  | $ 300

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