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Significant Restructuring Costs - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended | 30 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 USD ($) Employees Plant | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2018 USD ($) Employees Plant | Mar. 31, 2017 USD ($) | Mar. 31, 2018 Employees Plant
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs | $ | $ 0 | $ 158 | $ 99 | $ 78 | $ 158 | $ 177 |
Number of employees to be severed |  |  |  |  |  |  | 9,200
Number of employees severed | 2,700 |  |  |  | 2,700 |  | 2,700
Number of plants to be closed | Plant |  |  |  |  |  |  | 11
Plants closed | Plant | 4 |  |  |  | 4 |  | 4
Building Technologies & Solutions |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees to be severed |  |  |  |  |  |  | 7,300
Number of plants to be closed | Plant |  |  |  |  |  |  | 11
Corporate Segment |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees to be severed |  |  |  |  |  |  | 1,700
Power Solutions |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees to be severed |  |  |  |  |  |  | 200

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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