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Other assets impairments, restructuring and other items - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring and Impairment Costs [Line Items] |  |  |  |
Impairments of property, plant and equipment | $ 416 | $ 139 | $ 500 |
Business combination contingent consideration arrangements change in amount of contingent consideration liability | (81) | 59 | 57 |
Restructuring costs | 120 | $ 199 | $ 488 |
Expected revenue from Florida manufacturing plant in 2020 | $ 190 |  |  |
Restructuring plan cost reduction |  |  |  | $ 3,000

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