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Debt and Financing Arrangements Long-Term Debt (Details) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 EUR (€) | Sep. 30, 2016 USD ($) | Sep. 30, 2016 EUR (€)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Other Long-term Debt | $ 47,000,000 |  | $ 39,000,000 |
Capital lease obligations | 19,000,000 |  | 24,000,000 |
Long-term Debt and Capital Lease Obligations, Including Current Maturities | 12,403,000,000 |  | 15,234,000,000 |
Less: current portion | 394,000,000 |  | 628,000,000 |
Debt Issuance Costs, Line of Credit Arrangements, Gross | 45,000,000 |  | 74,000,000 |
Current portion of long-term debt | 0 |  | 38,000,000 |
Long-term debt | 0 |  | 3,441,000,000 |
Net long-term debt | 11,964,000,000 |  | 11,053,000,000 |
Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  |  | $ 4,000,000,000 |
7.125 % Due in 2017 | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.125% | 7.125%
Debt instrument, face amount |  |  | $ 150,000,000 |
Long-term Debt | 0 |  | $ 149,000,000 |
Two Point Six Percent Due Two Thousand Seventeen | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.60% | 2.60%
Debt instrument, face amount |  |  | $ 400,000,000 |
Long-term Debt | 0 |  | $ 404,000,000 |
Two Point Three Five Five Percent Due Two Thousand Seventeen | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.355% | 2.355%
Debt instrument, face amount |  |  | $ 46,000,000 |
Long-term Debt | $ 0 |  | $ 46,000,000 |
1.4% Due in 2018 | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.40% | 1.40% | 1.40% | 1.40%
Debt instrument, face amount | $ 41,000,000 |  | $ 300,000,000 |
Long-term Debt | $ 42,000,000 |  | 301,000,000 |
1.4% Due in 2018 | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.40% | 1.40% |  |
Debt instrument, face amount | $ 259,000,000 |  |  |
Long-term Debt | $ 259,000,000 |  | 0 |
Three Point Seven Five Percent Due in Two Thousand Eighteen [Member] | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% | 3.75% |  |
Debt instrument, face amount | $ 49,000,000 |  |  |
Long-term Debt | $ 49,000,000 |  | $ 0 |
Three Point Seven Five Percent Due in Two Thousand Eighteen [Member] | Tyco International Finance S.A. (TIFSA) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% | 3.75% | 3.75% | 3.75%
Debt instrument, face amount | $ 18,000,000 |  | $ 67,000,000 |
Long-term Debt | $ 18,000,000 |  | $ 69,000,000 |
5.0 % Due in 2020 | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% | 5.00% | 5.00% | 5.00%
Debt instrument, face amount | $ 47,000,000 |  | $ 500,000,000 |
Long-term Debt | $ 47,000,000 |  | 499,000,000 |
5.0 % Due in 2020 | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% | 5.00% |  |
Debt instrument, face amount | $ 452,000,000 |  |  |
Long-term Debt | $ 452,000,000 |  | $ 0 |
4.25% Due in 2021 | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.25% | 4.25% | 4.25% | 4.25%
Debt instrument, face amount | $ 53,000,000 |  | $ 500,000,000 |
Long-term Debt | $ 53,000,000 |  | 498,000,000 |
4.25% Due in 2021 | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.25% | 4.25% |  |
Debt instrument, face amount | $ 447,000,000 |  |  |
Long-term Debt | $ 446,000,000 |  | $ 0 |
3.75 % Due in 2022 | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% | 3.75% | 3.75% | 3.75%
Debt instrument, face amount | $ 22,000,000 |  | $ 450,000,000 |
Long-term Debt | $ 22,000,000 |  | 448,000,000 |
3.75 % Due in 2022 | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% | 3.75% |  |
Debt instrument, face amount | $ 428,000,000 |  |  |
Long-term Debt | $ 427,000,000 |  | 0 |
Four Point Six Two Five Percent Due in Two Thousand Twenty Three [Member] | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% | 4.625% |  |
Debt instrument, face amount | $ 35,000,000 |  |  |
Long-term Debt | $ 38,000,000 |  | $ 0 |
Four Point Six Two Five Percent Due in Two Thousand Twenty Three [Member] | Tyco International Finance S.A. (TIFSA) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% | 4.625% | 4.625% | 4.625%
Debt instrument, face amount | $ 7,000,000 |  | $ 42,000,000 |
Long-term Debt | $ 8,000,000 |  | 46,000,000 |
One Point Zero Percent Due Two Thousand Twenty Three | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.00% | 1.00% |  |
Debt instrument, face amount | € |  | € 1,000,000,000 |  |
Long-term Debt | $ 1,171,000,000 |  | $ 0 |
Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member] | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.625% | 3.625% | 3.625% | 3.625%
Debt instrument, face amount | $ 31,000,000 |  | $ 500,000,000 |
Long-term Debt | $ 31,000,000 |  | 500,000,000 |
Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member] | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.625% | 3.625% |  |
Debt instrument, face amount | $ 468,000,000 |  |  |
Long-term Debt | $ 468,000,000 |  | $ 0 |
Three Point Five Percent Due Two Thousand Twenty Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.50% | 3.50% |  |
Debt instrument, face amount | € |  | € 1,000,000,000 |  |
Three Point Five Percent Due Two Thousand Twenty Four [Member] | Adient |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.50% | 3.50%
Debt instrument, face amount | € |  |  |  | € 1,000,000,000
Long-term Debt | $ 0 |  | $ 1,119,000,000 |
One Point Three Seven Five Percent Due in Two Thousand Twenty Five [Member] | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.375% | 1.375% |  |
Debt instrument, face amount | € |  | € 423,000,000 |  |
Long-term Debt | $ 510,000,000 |  | $ 0 |
One Point Three Seven Five Percent Due in Two Thousand Twenty Five [Member] | Tyco International Finance S.A. (TIFSA) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.375% | 1.375% | 1.375% | 1.375%
Debt instrument, face amount | € |  | € 58,000,000 |  | € 500,000,000
Long-term Debt | $ 70,000,000 |  | $ 571,000,000 |
Three Point Ninety Percent Due in Two Thousand Twenty Six [Member] | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.90% | 3.90% |  |
Debt instrument, face amount | $ 698,000,000 |  |  |
Long-term Debt | $ 763,000,000 |  | $ 0 |
Three Point Ninety Percent Due in Two Thousand Twenty Six [Member] | Tyco International Finance S.A. (TIFSA) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.90% | 3.90% | 3.90% | 3.90%
Debt instrument, face amount | $ 51,000,000 |  | $ 750,000,000 |
Long-term Debt | $ 53,000,000 |  | $ 824,000,000 |
Four Point Eight Seven Five Percent Due Two Thousand Twenty Six [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.875% | 4.875% |  |
Long-term Debt | $ 900,000,000 |  |  |
Four Point Eight Seven Five Percent Due Two Thousand Twenty Six [Member] | Adient |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.875% | 4.875%
Debt instrument, face amount |  |  | $ 900,000,000 |
Long-term Debt | $ 0 |  | $ 900,000,000 |
Six Point Zero Percent Due Two Thousand Thirty Six [Member] | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% | 6.00% | 6.00% | 6.00%
Debt instrument, face amount | $ 8,000,000 |  | $ 400,000,000 |
Long-term Debt | $ 8,000,000 |  | 396,000,000 |
Six Point Zero Percent Due Two Thousand Thirty Six [Member] | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% | 6.00% |  |
Debt instrument, face amount | $ 392,000,000 |  |  |
Long-term Debt | $ 388,000,000 |  | $ 0 |
Five Point Seven Percent Due Two Thousand Forty One | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.70% | 5.70% | 5.70% | 5.70%
Debt instrument, face amount | $ 30,000,000 |  | $ 300,000,000 |
Long-term Debt | $ 30,000,000 |  | 299,000,000 |
Five Point Seven Percent Due Two Thousand Forty One | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.70% | 5.70% |  |
Debt instrument, face amount | $ 270,000,000 |  |  |
Long-term Debt | $ 269,000,000 |  | $ 0 |
Five Point Two Five Percent Due Two Thousand Forty Two | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% | 5.25% | 5.25% | 5.25%
Debt instrument, face amount | $ 8,000,000 |  | $ 250,000,000 |
Long-term Debt | $ 8,000,000 |  | 250,000,000 |
Five Point Two Five Percent Due Two Thousand Forty Two | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% | 5.25% |  |
Debt instrument, face amount | $ 242,000,000 |  |  |
Long-term Debt | $ 242,000,000 |  | $ 0 |
Four Point Six Two Five Percent Due Two Thousand Forty Four | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% | 4.625% | 4.625% | 4.625%
Debt instrument, face amount | $ 6,000,000 |  | $ 450,000,000 |
Long-term Debt | $ 6,000,000 |  | 447,000,000 |
Four Point Six Two Five Percent Due Two Thousand Forty Four | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% | 4.625% |  |
Debt instrument, face amount | $ 445,000,000 |  |  |
Long-term Debt | $ 441,000,000 |  | 0 |
Five Point One Two Five Percent Due in Two Thousand Forty Five [Member] | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.125% | 5.125% |  |
Debt instrument, face amount | $ 727,000,000 |  |  |
Long-term Debt | $ 872,000,000 |  | $ 0 |
Five Point One Two Five Percent Due in Two Thousand Forty Five [Member] | Tyco International Finance S.A. (TIFSA) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.125% | 5.125% | 5.125% | 5.125%
Debt instrument, face amount | $ 23,000,000 |  | $ 750,000,000 |
Long-term Debt | $ 23,000,000 |  | $ 903,000,000 |
Six Point Nine Five Percent Due Two Thousand Forty Six | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.95% | 6.95% | 6.95% | 6.95%
Debt instrument, face amount | $ 4,000,000 |  | $ 125,000,000 |
Long-term Debt | $ 4,000,000 |  | 125,000,000 |
Six Point Nine Five Percent Due Two Thousand Forty Six | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.95% | 6.95% |  |
Debt instrument, face amount | $ 121,000,000 |  |  |
Long-term Debt | $ 121,000,000 |  | 0 |
Four point five percent maturing in fiscal 2047 [Member] | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% | 4.50% |  |
Debt instrument, face amount | $ 500,000,000 |  |  |
Long-term Debt | $ 495,000,000 |  | $ 0 |
Four Point Nine Five Percent Due Two Thousand Sixty Four [Member] | Johnson Controls Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.95% | 4.95% | 4.95% | 4.95%
Debt instrument, face amount | $ 15,000,000 |  | $ 450,000,000 |
Long-term Debt | $ 15,000,000 |  | 449,000,000 |
Four Point Nine Five Percent Due Two Thousand Sixty Four [Member] | Johnson Controls International plc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.95% | 4.95% |  |
Debt instrument, face amount | $ 435,000,000 |  |  |
Long-term Debt | $ 434,000,000 |  | $ 0 |
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] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.50% | 1.50% | 1.50% | 1.50%
Long-term Debt | $ 3,700,000,000 |  |  |
LIBOR plus One Point Zero Zero Five Percent Due Two Thousand Twenty One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.005% | 1.005%
LIBOR plus One Point Zero Zero Five Percent Due Two Thousand Twenty One [Member] | Adient |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 0 |  | $ 1,500,000,000 |
Foreign Currency Denominated Debt [Member] | Euro Member Countries, Euro |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 43,000,000 |  | 61,000,000 |
Foreign Currency Denominated Debt [Member] | Japan, Yen |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 311,000,000 |  | 367,000,000 |
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 | $ 3,700,000,000 |  | $ 4,000,000,000 |

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