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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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