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Long-Term Debt Additional Details (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Debt Instrument [Line Items]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 394    
Long-term Debt, Maturities, Repayments of Principal in Year Two 27    
Long-term Debt, Maturities, Repayments of Principal in Year Three 4,201    
Long-term Debt, Maturities, Repayments of Principal in Year Four 501    
Long-term Debt, Maturities, Repayments of Principal in Year Five 804    
Long-term Debt, Maturities, Repayments of Principal after Year Five 6,476    
Interest Paid, Net 448 $ 319 $ 373
Tyco International Holding S.a.r.L. (TSarL) [Member]      
Debt Instrument [Line Items]      
Long-term Debt   4,000  
LIBOR plus One Point Five Percent Due in Two Thousand Twenty [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member]      
Debt Instrument [Line Items]      
Long-term Debt 3,700 4,000  
Euro Member Countries, Euro | Foreign Currency Denominated Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt $ 43 $ 61  
Debt, Weighted Average Interest Rate 1.20% 1.30%