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Debt and Financing Arrangements Long-Term Debt (Details) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€) | Sep. 30, 2018 JPY (¥) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Other Long-term Debt | $ 23,000,000 |  |  | $ 90,000,000 |
Capital lease obligations | 36,000,000 |  |  | 19,000,000 |
Long-term Debt and Capital Lease Obligations, Including Current Maturities | 9,724,000,000 |  |  | 12,403,000,000 |
Less: current portion | 26,000,000 |  |  | 394,000,000 |
Debt Issuance Costs, Line of Credit Arrangements, Gross | 44,000,000 |  |  | 45,000,000 |
Net long-term debt | $ 9,654,000,000 |  |  | 11,964,000,000 |
Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  |  |  | $ 4,000,000,000
1.4% Due in 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.40% | 1.40% | 1.40% |  |
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% |  |
Debt instrument, face amount | $ 41,000,000 |  |  |  |
Long-term Debt | $ 0 |  |  | 42,000,000 |
1.4% Due in 2018 | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.40% | 1.40% | 1.40% |  |
Debt instrument, face amount | $ 259,000,000 |  |  |  |
Long-term Debt | $ 0 |  |  | 259,000,000 |
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% | 3.75% |  |
Debt instrument, face amount | $ 49,000,000 |  |  |  |
Long-term Debt | $ 0 |  |  | 49,000,000 |
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% |  |
Debt instrument, face amount | $ 18,000,000 |  |  |  |
Long-term Debt | $ 0 |  |  | 18,000,000 |
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% |  |
Debt instrument, face amount | $ 47,000,000 |  |  |  |
Long-term Debt | $ 47,000,000 |  |  | 47,000,000 |
5.0 % Due in 2020 | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% | 5.00% | 5.00% |  |
Debt instrument, face amount | $ 453,000,000 |  |  |  |
Long-term Debt | $ 452,000,000 |  |  | 452,000,000 |
Zero Point Zero Percent Due Two Thousand Twenty-One [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.00% | 0.00% | 0.00% |  |
Debt instrument, face amount | € |  | € 750,000,000 |  |  |
Long-term Debt | $ 868,000,000 |  |  | 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% |  |
Debt instrument, face amount | $ 53,000,000 |  |  |  |
Long-term Debt | $ 53,000,000 |  |  | 53,000,000 |
4.25% Due in 2021 | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.25% | 4.25% | 4.25% |  |
Debt instrument, face amount | $ 447,000,000 |  |  |  |
Long-term Debt | $ 446,000,000 |  |  | 446,000,000 |
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% |  |
Debt instrument, face amount | $ 22,000,000 |  |  |  |
Long-term Debt | $ 22,000,000 |  |  | 22,000,000 |
3.75 % Due in 2022 | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% | 3.75% | 3.75% |  |
Debt instrument, face amount | $ 428,000,000 |  |  |  |
Long-term Debt | $ 427,000,000 |  |  | 427,000,000 |
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% | 4.625% |  |
Debt instrument, face amount | $ 35,000,000 |  |  |  |
Long-term Debt | $ 37,000,000 |  |  | 38,000,000 |
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% |  |
Debt instrument, face amount | $ 7,000,000 |  |  |  |
Long-term Debt | $ 8,000,000 |  |  | 8,000,000 |
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% | 1.00% |  |
Debt instrument, face amount | € |  | € 1,000,000,000 |  |  |
Long-term Debt | $ 1,154,000,000 |  |  | 1,171,000,000 |
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% |  |
Debt instrument, face amount | $ 31,000,000 |  |  |  |
Long-term Debt | $ 31,000,000 |  |  | 31,000,000 |
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% | 3.625% |  |
Debt instrument, face amount | $ 468,000,000 |  |  |  |
Long-term Debt | $ 468,000,000 |  |  | 468,000,000 |
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% | 1.375% |  |
Debt instrument, face amount | € |  | € 423,000,000 |  |  |
Long-term Debt | $ 501,000,000 |  |  | 510,000,000 |
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% |  |
Debt instrument, face amount | € |  | € 58,000,000 |  |  |
Long-term Debt | $ 69,000,000 |  |  | 70,000,000 |
One Point Three Seven Five Percent Due in Two Thousand Twenty Five [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | € |  | € 215,000,000 |  |  |
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% | 3.90% |  |
Debt instrument, face amount | $ 698,000,000 |  |  |  |
Long-term Debt | $ 755,000,000 |  |  | 763,000,000 |
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% |  |
Debt instrument, face amount | $ 51,000,000 |  |  |  |
Long-term Debt | $ 52,000,000 |  |  | 53,000,000 |
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% |  |
Debt instrument, face amount | $ 8,000,000 |  |  |  |
Long-term Debt | $ 8,000,000 |  |  | 8,000,000 |
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% | 6.00% |  |
Debt instrument, face amount | $ 392,000,000 |  |  |  |
Long-term Debt | $ 388,000,000 |  |  | 388,000,000 |
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% |  |
Debt instrument, face amount | $ 30,000,000 |  |  |  |
Long-term Debt | $ 30,000,000 |  |  | 30,000,000 |
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% | 5.70% |  |
Debt instrument, face amount | $ 270,000,000 |  |  |  |
Long-term Debt | $ 269,000,000 |  |  | 269,000,000 |
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% |  |
Debt instrument, face amount | $ 8,000,000 |  |  |  |
Long-term Debt | $ 8,000,000 |  |  | 8,000,000 |
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% | 5.25% |  |
Debt instrument, face amount | $ 242,000,000 |  |  |  |
Long-term Debt | $ 242,000,000 |  |  | 242,000,000 |
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% |  |
Debt instrument, face amount | $ 6,000,000 |  |  |  |
Long-term Debt | $ 6,000,000 |  |  | 6,000,000 |
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% | 4.625% |  |
Debt instrument, face amount | $ 445,000,000 |  |  |  |
Long-term Debt | $ 441,000,000 |  |  | 441,000,000 |
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% | 5.125% |  |
Debt instrument, face amount | $ 727,000,000 |  |  |  |
Long-term Debt | $ 867,000,000 |  |  | 872,000,000 |
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% |  |
Debt instrument, face amount | $ 23,000,000 |  |  |  |
Long-term Debt | $ 23,000,000 |  |  | 23,000,000 |
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% |  |
Debt instrument, face amount | $ 4,000,000 |  |  |  |
Long-term Debt | $ 4,000,000 |  |  | 4,000,000 |
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% | 6.95% |  |
Debt instrument, face amount | $ 121,000,000 |  |  |  |
Long-term Debt | $ 121,000,000 |  |  | 121,000,000 |
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% | 4.50% |  |
Debt instrument, face amount | $ 500,000,000 |  |  |  |
Long-term Debt | $ 496,000,000 |  |  | 495,000,000 |
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% |  |
Debt instrument, face amount | $ 15,000,000 |  |  |  |
Long-term Debt | $ 15,000,000 |  |  | 15,000,000 |
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% | 4.95% |  |
Debt instrument, face amount | $ 435,000,000 |  |  |  |
Long-term Debt | $ 434,000,000 |  |  | 434,000,000 |
LIBOR plus One Point Two 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 | 1.25% | 1.25% | 1.25% |  |
Long-term Debt | $ 364,000,000 |  |  |  |
EURIBOR plus Zero Point Six Two 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 | 0.62% | 0.62% | 0.62% |  |
Long-term Debt | $ 250,000,000 |  |  |  |
LIBOR JPY Plus Zero Point Four Two Percent Due in Two Thousand Twenty Two [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.40% | 0.40% | 0.40% |  |
Debt instrument, face amount | ¥ |  |  | ¥ 35,000,000,000 |  |
Long-term Debt | $ 309,000,000 |  |  |  |
LIBOR JPY Plus Zero Point Four Two Percent Due in Two Thousand Twenty Two [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  |  | 311,000,000 |
EURIBOR plus Zero Point Six Two Percent due in Two Thousand Twenty [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  |  | 0 |
LIBOR plus One Point Two 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

X
- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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