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Significant Restructuring Costs - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended		42 Months Ended
	Mar. 31, 2020 USD ($) Plant Employees	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) Plant Employees	Mar. 31, 2019 USD ($)	Mar. 31, 2020 Plant Employees
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs | $	$ 62	$ 0	$ 173	$ 0
Number of employees to be severed					11,200
Number of employees severed	9,600		9,600		9,600
Number of plants to be closed | Plant					9
Plants closed | Plant	8		8		8
Building Technologies & Solutions
Restructuring Cost and Reserve [Line Items]
Number of employees to be severed					9,000
Number of plants to be closed | Plant					9
Corporate Segment
Restructuring Cost and Reserve [Line Items]
Number of employees to be severed					2,200

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Number of plants closed.

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The expected number of positions to be eliminated as a result of restructuring activities.

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The number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s).

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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