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Debt and Financing Arrangements Financing Arrangements (Details) ¥ in Billions |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 04, 2017 USD ($) | Dec. 28, 2016 USD ($) | Dec. 28, 2016 EUR (€) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 JPY (¥) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 EUR (€) | Sep. 30, 2017 JPY (¥) | Mar. 31, 2017 EUR (€) | Dec. 28, 2016 EUR (€) | Sep. 30, 2016 EUR (€) | Mar. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt traunches |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Amount Of Credit Facility Retired | € |  |  |  |  |  |  |  |  |  |  | € 390,000,000 |  |  |  |  |
Number of term loans repaid |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
LIBOR plus One Point Zero Zero Five Percent Due Two Thousand Twenty One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes |  |  |  |  |  |  |  | 1.005% |  | 1.005% |  |  |  |  | 1.005% |
Three Point Five Percent Due Two Thousand Twenty Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  |  | € 1,000,000,000 |  |  |  |  |
Interest rate on notes |  |  |  | 3.50% |  |  |  |  | 3.50% |  | 3.50% | 3.50% |  |  |  |
Committed Five-year Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Amount Of Credit Facility Retired |  |  |  |  |  |  |  | $ 2,500,000,000 |  | $ 2,500,000,000 |  |  |  |  |  |
Dollar denominated notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  | $ 5,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  | 6,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregrate principal amount of existing notes outstanding |  | $ 380,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series of existing notes outstanding |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro denominated notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount | € |  |  | € 423,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | € |  |  | € 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregrate principal amount of existing notes outstanding | € |  |  |  |  |  |  |  |  |  |  |  |  |  | € 77,400,000 |  |
Series of existing notes outstanding |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Four Point Eight Seven Five Percent Due Two Thousand Twenty Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Three Point Five Percent Due Two Thousand Twenty Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  | 8 years |  |  |  |  |  |  |  |
500 million USD floating rate term loan maturing in September 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt retired, amount |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
100 Million USD floating rate term loan maturing in Nov 2016 [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  | 9 months | 9 months |  |  |  |  |  |  |  |  |
Debt retired, amount |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |
125 Million USD floating rate term loan maturing in Sept 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt retired, amount |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  |  |  |  |
200 Million USD floating rate term loan maturing in Sept 2016 [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt retired, amount |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |
90 million USD revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt retired, amount |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  |  |
35 billion yen floating rate syndicated term loan maturing in September 2022 [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  |  |  |  |  |  | ¥ 35 |  |  |  |
Debt Instrument, Term |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Seven Point One Two Five Percent Due Two Thousand Seventeen [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  | 0.07125 |  |  |  |  |  |  |  |  |  |  |  |
Debt retired, amount |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
One percent maturing in fiscal 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  |  |  |  | € 1,000,000,000 |  |  |
Debt Instrument, Interest Rate Terms |  |  |  |  | 0.01 |  |  |  |  |  |  |  |  |  |  |
Two Point Three Five Five Percent Due Two Thousand Seventeen |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  |  | 0.02355 |  |  |  |  |  |  |  |  |  |  |
Debt retired, amount |  |  |  |  | $ 46,000,000 |  |  |  |  |  |  |  |  |  |  |
One Point Three Seven Five Percent Due in Two Thousand Twenty Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  | 0.01375 | 0.01375 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount | € |  |  |  |  |  |  |  |  |  |  | € 4,000,000 |  | € 15,000,000 |  |  |
Four point five percent maturing in fiscal 2047 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  |  | 0.045 |  |  |  |  |  |  |  |  |  |  |
Two Point Six Percent Due Two Thousand Seventeen |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  |  |  | 0.026 | 0.026 |  |  |  |  |  |  |  |  |
Debt retired, amount |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |
37 billion yen floating rate syndicated term loan maturing in June 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt retired, amount | ¥ |  |  |  |  |  |  | ¥ 37 |  |  |  |  |  |  |  |  |
Contingent on consumation of Tyco merger [Domain] | 2.0 billion USD revolving credit facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000
Proceeds from Lines of Credit |  |  |  |  |  |  |  |  | $ 0 | 0 |  |  |  |  |  |
Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  | 4,000,000,000 |  | 4,000,000,000 |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |
Tyco International Holding S.a.r.L. (TSarL) [Member] | LIBOR plus One Point Five Percent Due in Two Thousand Twenty [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | $ 3,700,000,000 |  |  |  | 4,000,000,000 | 3,700,000,000 | 4,000,000,000 |  |  |  |  |  |
Johnson Controls International plc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  |  |  |  |  |  |  |  | 1,500,000,000 |  |  |  |  |  |  |
Johnson Controls International plc [Member] | 1.4% Due in 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | 259,000,000 |  |  |  | 0 | 259,000,000 | 0 |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 259,000,000 |  |  |  |  | $ 259,000,000 |  |  |  |  |  |  |
Interest rate on notes |  |  |  | 1.40% |  |  |  |  | 1.40% |  | 1.40% | 1.40% |  |  |  |
Johnson Controls International plc [Member] | Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | $ 468,000,000 |  |  |  | 0 | $ 468,000,000 | 0 |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 468,000,000 |  |  |  |  | $ 468,000,000 |  |  |  |  |  |  |
Interest rate on notes |  |  |  | 3.625% |  |  |  |  | 3.625% |  | 3.625% | 3.625% |  |  |  |
Johnson Controls International plc [Member] | Four Point Nine Five Percent Due Two Thousand Sixty Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | $ 434,000,000 |  |  |  | $ 0 | $ 434,000,000 | 0 |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 435,000,000 |  |  |  |  | $ 435,000,000 |  |  |  |  |  |  |
Interest rate on notes |  |  |  | 4.95% |  |  |  |  | 4.95% |  | 4.95% | 4.95% |  |  |  |
Adient |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 1,500,000,000 |  | 1,500,000,000 |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Proceeds from Lines of Credit |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Adient | LIBOR plus One Point Zero Zero Five Percent Due Two Thousand Twenty One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | $ 0 |  |  |  | $ 1,500,000,000 | 0 | 1,500,000,000 |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Adient | Three Point Five Percent Due Two Thousand Twenty Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | $ 0 |  |  |  | $ 1,119,000,000 | $ 0 | $ 1,119,000,000 |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1,000,000,000 |
Interest rate on notes |  |  |  |  |  |  |  | 3.50% |  | 3.50% |  |  |  |  | 3.50% |
Subsequent Event [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | $ 1,900,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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