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v3.20.2

Restructuring and Other Initiatives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 21 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | $ 343 | $ 480 | $ 919 | $ 564 | $ 1,122 | $ 1,122 |
Additions, interest accretion and other |  | 80 | 211 | 334 | 499 |  |
Payments |  | (185) | (162) | (523) | (645) |  |
Revisions to estimates and effect of foreign currency |  | (32) | (30) | (32) | (38) |  |
Balance at end of period |  | 343 | 938 | 343 | 938 | 343 |
GMI [Member] | Australia, New Zealand and Thailand [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges |  |  |  | 657 |  |  |
GMI [Member] | Australia, New Zealand and Thailand [Member] | Supplier Claims [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges |  | $ 76 |  |  |  |  |
GMI [Member] | Australia, New Zealand and Thailand [Member] | Asset Impairments, Sales Allowances, Inventory Provisions and Other Charges [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges |  |  |  | 367 |  |  |
GMI [Member] | Australia, New Zealand and Thailand [Member] | Dealer Restructuring and Employee Separation Payments [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  |  | (222) |  |  |
Pre-tax restructuring charges |  |  |  | 290 |  |  |
GMI [Member] | Australia and New Zealand [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Valuation allowance against deferred tax assets |  |  |  | 236 |  |  |
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 |  |
Cost since inception |  |  |  |  |  |  | $ 3,100
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] | Employee Severance and Statutory Pension Payments [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  |  | $ (314) | (645) |  |
GMNA [Member] | Non-cash Accelerated Depreciation, Pension Curtailment and Other Charges [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Pre-tax restructuring charges |  |  |  |  | $ 1,100 |  |
GMNA [Member] | Employee Severance and Supplier-related Payments [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  |  |  |  | $ (1,400) |
Forecast [Member] | GMI [Member] | Australia, New Zealand and Thailand [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Expected amount of cash flows | (40) |  |  |  |  |  |
Forecast [Member] | GMI [Member] | Thailand [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Proceeds from sale of business | 140 |  |  |  |  |  |
Forecast [Member] | GMNA [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Expected amount of cash flows | $ (100) |  |  |  |  |  |

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