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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 15 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 564 | $ 1,122 | $ 564 | $ 1,122 |
Additions, interest accretion and other | 219 | 46 |  |  |
Payments | (175) | (317) |  |  |
Revisions to estimates and effect of foreign currency | (25) | (21) |  |  |
Balance at end of period | 583 | 830 |  | 583 |
GMI [Member] | Australia, New Zealand and Thailand [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Pre-tax restructuring charges | 489 |  |  |  |
Expected costs | 400 |  |  | 400 |
GMI [Member] | Australia, New Zealand and Thailand [Member] | Asset Impairments, Sales Allowances and Other Charges [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Pre-tax restructuring charges | 270 |  |  |  |
GMI [Member] | Australia, New Zealand and Thailand [Member] | Dealer Restructurings and Employee Severance [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Pre-tax restructuring charges | 219 |  |  |  |
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 |  | 790 |  |  |
Cost since inception |  |  |  |  | $ 3,100
GMNA [Member] | Employee Severance and Statutory Pension Payments [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Payments | $ (171) | $ (315) |  | $ (1,300) |
Forecast [Member] | GMI [Member] | Australia, New Zealand and Thailand [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Expected amount of cash flows |  |  | 300 |  |
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 |  |  | $ 200 |  |

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