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Segment Information Financial Information Related to Company's Reportable Segments (Additional Information) (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 USD ($) Segment Person | Sep. 30, 2020 USD ($) Person | Sep. 30, 2019 USD ($) Person
Segment Information [Line Items] |  |  |
Number of reportable segments | Segment | 4 |  |
Restructuring and impairment costs | $ 242 | $ 783 | $ 235
Equity income in segment income | $ 261 | $ 171 | $ 192
Number of customers that individually accounted for 10 % or more of consolidated net sales | Person | 0 | 0 | 0
Percentage of individual customer sales to consolidated net sales threshold for disclosure as major customer | 10.00% | 10.00% | 10.00%
Building Solutions North America |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | $ 8 | $ 7 | $ 8
Building Solutions North America | Building Technologies & Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs | 70 | 520 |
Equity income in segment income | 5 | (1) |
Global Products |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | 945 | 797 | 730
Global Products | Building Technologies & Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs | 91 | 143 | 235
Equity income in segment income | 250 | 166 | 179
Building Solutions EMEA/LA |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | 111 | 108 | 109
Building Solutions EMEA/LA | Building Technologies & Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs | 29 | 59 |
Equity income in segment income | 5 | 6 | 12
Building Solutions Asia Pacific |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | 2 | 2 | 6
Building Solutions Asia Pacific | Building Technologies & Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs | 28 | 56 |
Equity income in segment income | $ 1 | $ 1 | $ 1

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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