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v3.19.1

Restructuring and Other Initiatives (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at beginning of period | $ 1,122 | $ 227 |  |
Additions, interest accretion and other | 46 | 455 |  |
Payments | (317) | (37) |  |
Revisions to estimates and effect of foreign currency | (21) | (12) |  |
Balance at end of period | 830 | 633 |  |
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Payments | (315) |  |  |
Pre-tax restructuring charges | 790 |  |  |
Cost since inception | $ 2,100 |  |  |
GMI [Member] | Korea [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Pre-tax restructuring charges |  | 900 |  |
GMI [Member] | Korea [Member] | Non-cash Asset Impairments [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Pre-tax restructuring charges |  | 464 |  |
GMI [Member] | Korea [Member] | Employee Separation Charges [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Pre-tax restructuring charges |  | $ 436 |  |
Forecast [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Expected amount of cash flows |  |  | $ 1,500 |
Forecast [Member] | Minimum [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Expected costs |  |  |  | $ 900
Forecast [Member] | Maximum [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Expected costs |  |  |  | $ 1,500

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