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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 |  |

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