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v3.19.2

Restructuring and Other Initiatives (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2019
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | $ 830 | $ 633 | $ 1,122 | $ 227 |  | $ 227 |
Additions, interest accretion and other | 242 | 137 | 288 | 592 |  |  |
Payments | (166) | (458) | (483) | (495) |  |  |
Revisions to estimates and effect of foreign currency | 13 | (38) | (8) | (50) |  |  |
Balance at end of period | 919 | 274 | 919 | 274 |  | 1,122 |
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  | (487) |  |  |  |
Cost since inception | 2,500 |  | 2,500 |  |  |  |
GMNA [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges | 361 |  | 1,200 |  |  |  |
GMNA [Member] | Supplier-related Charges [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges | 231 |  | 240 |  |  |  |
GMNA [Member] | Non-cash Accelerated Depreciation [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges | $ 130 |  | $ 911 |  |  |  |
GMI [Member] | Korea [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges |  | 132 |  | 1,000 |  |  |
GMI [Member] | Korea [Member] | Supplier Claims [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges |  | 73 |  |  |  |  |
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 |  | $ 59 |  | 495 |  |  |
GMI [Member] | Korea [Member] | Employee Severance and Statutory Pension Payments [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  |  | $ (676) |  | $ (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 |  |  |  |  | $ 1,300 |  |
Forecast [Member] | Minimum [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Expected costs |  |  |  |  |  |  | $ 500
Forecast [Member] | Maximum [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Expected costs |  |  |  |  |  |  | $ 1,100

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