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Significant Restructuring Costs - Additional Information (Detail) $ in Millions	3 Months Ended			9 Months Ended		36 Months Ended
	Jun. 30, 2019 USD ($) Plant Employees	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2019 USD ($) Plant Employees	Jun. 30, 2018 USD ($)	Sep. 30, 2018 Plant Employees
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs | $	$ 235	$ 0	$ 154	$ 235	$ 154
Number of employees to be severed						11,300
Number of employees severed	5,200			5,200
Number of plants to be closed | Plant						12
Plants closed | Plant	10			10
Building Technologies & Solutions
Restructuring Cost and Reserve [Line Items]
Number of employees to be severed						9,100
Number of plants to be closed | Plant						12
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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