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Business Segments Information (Financial Information By Geographic Area) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 4,947 | $ 4,697 | $ 4,431 | $ 4,161 | $ 4,558 | $ 3,914 | $ 4,162 | $ 4,151 | $ 18,236 | $ 16,785 | $ 18,372
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,952 | 7,420 | 8,390
Property, Plant and Equipment | 2,141 |  |  |  | 2,124 |  |  |  | 2,141 | 2,124 | 2,128
China |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,252 | 1,845 | 1,962
Reportable Geographical Components [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 18,263 | 16,798 | 18,371
Property, Plant and Equipment | 3,738 |  |  |  | 3,688 |  |  |  | 3,738 | 3,688 | 3,642
Reportable Geographical Components [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,613 | 8,947 | 10,103
Property, Plant and Equipment | 2,375 |  |  |  | 2,345 |  |  |  | 2,375 | 2,345 | 2,339
Reportable Geographical Components [Member] | Asia, Middle East & Africa |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 5,323 | 4,854 | 5,083
Property, Plant and Equipment | 678 |  |  |  | 679 |  |  |  | 678 | 679 | 671
Reportable Geographical Components [Member] | Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,327 | 2,997 | 3,185
Property, Plant and Equipment | $ 685 |  |  |  | $ 664 |  |  |  | 685 | 664 | 632
Automation Solutions [Member] | Reportable Geographical Components [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 11,610 | 11,155 | 12,202
Automation Solutions [Member] | Reportable Geographical Components [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 5,100 | 5,051 | 5,850
Automation Solutions [Member] | Reportable Geographical Components [Member] | Asia, Middle East & Africa |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,046 | 3,801 | 3,891
Automation Solutions [Member] | Reportable Geographical Components [Member] | Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,464 | 2,303 | 2,461
Commercial & Residential Solutions [Member] | Reportable Geographical Components [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,653 | 5,643 | 6,169
Commercial & Residential Solutions [Member] | Reportable Geographical Components [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,513 | 3,896 | 4,253
Commercial & Residential Solutions [Member] | Reportable Geographical Components [Member] | Asia, Middle East & Africa |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,277 | 1,053 | 1,192
Commercial & Residential Solutions [Member] | Reportable Geographical Components [Member] | Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 863 | $ 694 | $ 724

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