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Other assets impairments, restructuring and other items - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020
Restructuring and Impairment Costs [Line Items]
Impairments of long-lived tangible assets	[1]	$ 56	$ 28	$ 408	$ 96
Impairments of property, plant and equipment		56		408
Restructuring costs		9	61	82	140
Business combination contingent consideration arrangements change in amount of contingent consideration liability		(179)	51	(96)	4
Scenario, Forecast [Member]
Restructuring and Impairment Costs [Line Items]
Expected revenue from Florida manufacturing plant in 2020						$ 150
Restructuring Cost [Member]
Restructuring and Impairment Costs [Line Items]
Business combination contingent consideration arrangements change in amount of contingent consideration liability		$ (179)	$ 51	$ (96)	$ 4
[1] Including impairments related to exit and disposal activities

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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