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Debt and Financing Arrangements Short-Term Debt (Details)
€ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2018
USD ($)
Sep. 30, 2016
USD ($)
Short-term Debt [Line Items]              
Document Period End Date       Sep. 30, 2019 Sep. 30, 2019    
Short-term Debt       $ 10,000,000   $ 1,306,000,000  
Short-term Debt, Weighted Average Interest Rate, at Point in Time       2.00%   2.80%  
Commercial Paper [Member]              
Short-term Debt [Line Items]              
Commercial Paper           $ 879,000,000  
Revolving Credit Facility [Member] | $200 million USD expiring in Jan 2020 [Member]              
Short-term Debt [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity       $ 200,000,000      
Revolving Credit Facility [Member] | $250 million USD expiring in Mar 2020 [Member]              
Short-term Debt [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity       250,000,000      
Revolving Credit Facility [Member] | 250 million USD maturing in Mar 2019 [Member]              
Short-term Debt [Line Items]              
Debt Instrument, Term 364 days            
Line of Credit Facility, Borrowing Capacity, Expired $ 250,000,000            
Revolving Credit Facility [Member] | 150 million USD maturing in Feb 2019 [Member]              
Short-term Debt [Line Items]              
Debt Instrument, Term 364 days            
Line of Credit Facility, Borrowing Capacity, Expired $ 150,000,000            
Revolving Credit Facility [Member] | $150 million USD expiring in February 2020 [Member]              
Short-term Debt [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity       150,000,000      
Revolving Credit Facility [Member] | 200 million USD maturing in Jan 2019 [Member]              
Short-term Debt [Line Items]              
Debt Instrument, Term 364 days            
Line of Credit Facility, Borrowing Capacity, Expired $ 200,000,000            
Revolving Credit Facility [Member] | $350 million USD expiring in Jan 2020 [Member]              
Short-term Debt [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity $ 350,000,000            
Notes Payable to Banks [Member] | $750 million term loan due earlier of Jan 2020 or 5 days after PS Close [Member]              
Short-term Debt [Line Items]              
Repayments of Debt     $ 750,000,000        
Tyco International Holding S.a.r.L. (TSarL) [Member]              
Short-term Debt [Line Items]              
Repayments of Debt   $ 1,900,000,000          
Long-term Debt           $ 4,000,000,000.0 $ 4,000,000,000.0
Tyco International Holding S.a.r.L. (TSarL) [Member] | Revolving Credit Facility [Member] | $1.25 billion due August 2020 [Domain]              
Short-term Debt [Line Items]              
Line of Credit, Borrowing Capacity, Terminated       $ 1,250,000,000      
Tyco International Holding S.a.r.L. (TSarL) [Member] | Revolving Credit Facility [Member] | $250 million USD expiring in Mar 2020 [Member]              
Short-term Debt [Line Items]              
Debt Instrument, Term       364 days 364 days    
Notes Payable to Banks [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] | $364 million due March 2020 [Domain]              
Short-term Debt [Line Items]              
Repayments of Debt       $ 364,000,000      
Notes Payable to Banks [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] | $250 million USD expiring in Mar 2020 [Member]              
Short-term Debt [Line Items]              
Repayments of Debt       $ 250,000,000      
Notes Payable to Banks [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] | 215 million euro floating due July 2019 [Domain]              
Short-term Debt [Line Items]              
Debt Instrument, Term       18 months 18 months    
Repayments of Debt | €         € 215