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Acquisitions and Divestitures - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Acquisitions And Divestitures [Line Items] |  |  |
Cash paid for business acquisition |  | $ 707 | $ 59
Goodwill, Acquired During Period |  | 273 |
Business divestitures, net of cash divested |  | 19 | 0
Goodwill, Written off Related to Sale of Business Unit |  | 7 |
Building Solutions EMEA/LA |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Goodwill, Acquired During Period |  | 21 |
Goodwill, Written off Related to Sale of Business Unit |  | 0 |
Building Solutions Asia Pacific |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Goodwill, Acquired During Period |  | 0 |
Goodwill, Written off Related to Sale of Business Unit |  | 7 |
Global Products |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Goodwill, Acquired During Period |  | 235 |
Goodwill, Written off Related to Sale of Business Unit |  | 0 |
Building Solutions North America |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Goodwill, Acquired During Period |  | 17 |
Goodwill, Written off Related to Sale of Business Unit |  | 0 |
Business Divestitures, Not Specific | Building Solutions Asia Pacific |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Proceeds from Divestiture of Businesses | $ 27 | 27 |
Business divestitures, net of cash divested |  | 19 |
Goodwill, Written off Related to Sale of Business Unit |  | 7 |
Silent-Aire |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Purchase price, net of cash acquired | 751 |  |
Cash paid for business acquisition | 661 |  |
Business Combination, Contingent Consideration, Liability | 90 | 90 |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 250 | 250 |
Silent-Aire | Global Products |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Goodwill, Acquired During Period | $ 235 |  |
Individually Immaterial Acquisitions |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Purchase price, net of cash acquired |  | 58 | 63
Cash paid for business acquisition |  | 46 | 59
Individually Immaterial Acquisitions | Building Solutions EMEA/LA |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Goodwill, Acquired During Period |  | 21 | 23
Individually Immaterial Acquisitions | Global Products |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Goodwill, Acquired During Period |  |  | $ 19
Individually Immaterial Acquisitions | Building Solutions North America |  |  |
Acquisitions And Divestitures [Line Items] |  |  |
Goodwill, Acquired During Period |  | $ 17 |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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