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Acquisitions and Divestitures - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 02, 2016 USD ($) | Mar. 31, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) Acquisition
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Purchase price, net of cash acquired | $ 19,671,000,000 |  |  |  |  |
Cash paid for business acquisition |  |  |  |  | $ 6,000,000 | $ 133,000,000
Goodwill, Acquired During Period |  |  |  |  | (158,000,000) |
Reduction in goodwill related to business divestitures |  |  |  |  | 1,270,000,000 |
Proceeds from business divestitures, net of cash divested |  |  |  |  | 180,000,000 | 54,000,000
Adjustment to purchase price of previous acquisition |  |  |  |  | 75,000,000 | 0
Gain on divestitures - net |  |  |  |  | 0 | 14,000,000
Business Divestitures, Not Specific [Member] |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  |  | $ 4,000,000 |
Number Of Businesses Divested |  |  |  |  | 1 |
Cash Divested from Deconsolidation |  |  |  |  | $ 5,000,000 |
Proceeds from business divestitures, net of cash divested |  |  |  |  | $ 52,000,000 | $ 40,000,000
Individually Immaterial Acquisitions |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Number of acquisitions |  |  |  |  | 3 | 1
Purchase price, net of cash acquired |  |  |  |  | $ 9,000,000 | $ 0
Cash paid for business acquisition |  |  |  |  | 6,000,000 | 3,000,000
Goodwill, Acquired During Period |  |  |  |  | 2,000,000 | 4,000,000
Buildings Tyco [Member] | Scott Safety business [Member] |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | $ 2,000,000,000 |  |  |  |
Buildings Tyco [Member] | Scott Safety business [Member] | Minimum [Member] |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | 1,800,000,000 |  |  |  |
Buildings Tyco [Member] | Scott Safety business [Member] | Maximum [Member] |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | 1,900,000,000 |  |  |  |
Buildings Tyco [Member] | ADT security business in South Africa [Member] |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | 129,000,000 |  |  |  |
Reduction in goodwill related to business divestitures |  | $ 92,000,000 |  |  |  |
Building Efficiency Asia | Hitachi Joint Venture [Member] |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  | $ 253,000,000 |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 60.00% |  |
Payments to Acquire Interest in Joint Venture |  |  |  | $ 208,000,000 | 75,000,000 | 133,000,000
Purchase Price of Joint Venture |  |  |  | 638,000,000 |  |
Cash Acquired from Acquisition |  |  |  | $ 430,000,000 |  |
Building Efficiency Rest of World [Member] | Individually Immaterial Acquisitions |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Step acquisition, non-cash gain in equity interest in acquiree |  |  |  |  |  | $ 4,000,000
Building Efficiency Systems and Service North America |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Reduction in goodwill related to business divestitures |  |  | $ 3,000,000 |  |  |
Proceeds from business divestitures, net of cash divested |  |  | 14,000,000 |  |  |
Sales Price of Business Divestitures |  |  | 16,000,000 |  |  |
Gain on divestitures - net |  |  | $ 14,000,000 |  |  |
Power Solutions |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  | 0 |
Reduction in goodwill related to business divestitures |  |  |  |  | $ 0 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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