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Debt and Financing Arrangements Short-Term Debt (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 EUR (€) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 EUR (€) | Mar. 31, 2016 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term Debt |  |  |  | $ 1,214,000,000 | $ 1,078,000,000 |  |
Short-term Debt, Weighted Average Interest Rate |  |  |  | 1.60% | 1.10% | 1.60% |
Amount Of Credit Facility Retired | € |  |  |  |  |  | € 390,000,000 |
Number of ten-month floating rate term loans maturing in Oct 2016 |  | 2 | 2 |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Commercial Paper |  |  |  | $ 954,000,000 | $ 440,000,000 |  |
150 million euro floating rate, term loan maturing in Sep 2018 [Domain] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Debt Instrument, Term | 364 days |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  | € 150,000,000 |
150 million USD revolving credit facility maturing in Mar 2018 [Domain] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 150,000,000 |  |  |  |  |  |
Debt Instrument, Term | 364 days |  |  |  |  |  |
Proceeds from Lines of Credit | $ 0 |  |  |  |  |  |
150 million USD revolving credit facility maturing in Feb 2018 [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 150,000,000 |  |  |  |  |  |
Debt Instrument, Term | 364 days |  |  |  |  |  |
Proceeds from Lines of Credit | $ 0 |  |  |  |  |  |
250 million USD revolving credit facility maturing in Jan 2018 [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 250,000,000 |  |  |  |  |  |
Debt Instrument, Term | 364 days |  |  |  |  |  |
Proceeds from Lines of Credit | $ 0 |  |  |  |  |  |
100 million euro floating rate term loan maturing in Dec 2017 [Domain] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Debt Instrument, Term |  | 364 days | 364 days |  |  |  |
Debt instrument, face amount | € |  |  | € 100,000,000 |  |  |  |
100 Million USD Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Amount of Credit Facilities Expired |  | $ 100,000,000 |  |  |  |  |
Proceeds from Lines of Credit |  | $ 0 |  |  |  |  |
100 Million USD floating rate term loan maturing in Nov 2016 [Domain] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Debt Instrument, Term |  | 9 months | 9 months |  |  |  |
Debt retired, amount |  | $ 100,000,000 |  |  |  |  |
100 million euro floating rate term loan maturing in Oct 2016 [Domain] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Debt Instrument, Term |  | 9 months | 9 months |  |  |  |
Debt retired, amount | € |  |  | € 100,000,000 |  |  |  |
35 Million USD Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Amount of Credit Facilities Expired |  | $ 35,000,000 |  |  |  |  |
Proceeds from Lines of Credit |  | $ 0 |  |  |  |  |
325 million USD floating rate term loans maturing in Oct 2016 [Domain] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Debt Instrument, Term |  | 10 months | 10 months |  |  |  |
Debt retired, amount |  | $ 325,000,000 |  |  |  |  |
Committed Five-year Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Amount Of Credit Facility Retired |  |  |  |  | 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
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 |  |
Debt Instrument, Term | 4 years |  |  |  |  |  |

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