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Debt and Financing Arrangements Short-Term Debt (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2016 | Sep. 30, 2017
Short-term Debt [Line Items] |  |  |  |
Short-term Debt |  | $ 1,315,000,000 |  | $ 1,214,000,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  | 2.80% |  | 1.60%
Commercial Paper [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Commercial Paper |  | $ 879,000,000 |  | $ 954,000,000
Committed Five-year Credit Facility |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Amount Of Credit Facility Retired | $ 2,500,000,000 |  | $ 2,500,000,000 |
Debt Instrument, Term | 5 years |  |  |
Contingent on consumation of Tyco merger [Domain] | 2.0 billion USD revolving credit facility [Domain] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,000,000,000 |  | 2,000,000,000 |
Debt Instrument, Term | 4 years |  |  |
Proceeds from Lines of Credit |  | $ 0 | 0 |
Tyco International Holding S.a.r.L. (TSarL) [Member] | 1.0 billion USD revolving credit facility [Domain] [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,000,000,000 |  | $ 1,000,000,000 |
Debt Instrument, Term | 4 years |  |  |

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