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Business Segment Information Geographic Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 4,570 | $ 4,248 | $ 8,717 | $ 8,064
Reportable Geographical Components [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 4,571 | 4,254 | 8,708 | 8,078
Reportable Geographical Components [Member] | Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,605 | 2,355 | 4,917 | 4,419
Reportable Geographical Components [Member] | Asia, Middle East & Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,195 | 1,208 | 2,301 | 2,346
Reportable Geographical Components [Member] | Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 771 | 691 | 1,490 | 1,313
Reportable Geographical Components [Member] | Automation Solutions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,010 | 2,771 | 5,809 | 5,343
Reportable Geographical Components [Member] | Automation Solutions [Member] | Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,523 | 1,372 | 2,928 | 2,658
Reportable Geographical Components [Member] | Automation Solutions [Member] | Asia, Middle East & Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 910 | 868 | 1,751 | 1,658
Reportable Geographical Components [Member] | Automation Solutions [Member] | Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 577 | 531 | 1,130 | 1,027
Reportable Geographical Components [Member] | Commercial & Residential Solutions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,561 | 1,483 | 2,899 | 2,735
Reportable Geographical Components [Member] | Commercial & Residential Solutions [Member] | Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,082 | 983 | 1,989 | 1,761
Reportable Geographical Components [Member] | Commercial & Residential Solutions [Member] | Asia, Middle East & Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 285 | 340 | 550 | 688
Reportable Geographical Components [Member] | Commercial & Residential Solutions [Member] | Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 194 | $ 160 | $ 360 | $ 286

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