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Debt and Financing Arrangements Long-Term Debt (Details) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 EUR (€) | Sep. 30, 2021 JPY (¥) | Sep. 30, 2020 USD ($)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Other Long-term Debt | $ 8,000,000 |  |  | $ 8,000,000
Long-term Debt and Capital Lease Obligations, Including Current Maturities | 7,764,000,000 |  |  | 7,822,000,000
Less: current portion | 226,000,000 |  |  | 262,000,000
Debt Issuance Costs, Net | 32,000,000 |  |  | 34,000,000
Net long-term debt | $ 7,506,000,000 |  |  | 7,526,000,000
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 | $ 25,000,000 |  |  |
Long-term Debt | $ 25,000,000 |  |  | 26,000,000
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 | $ 7,000,000 |  |  | 7,000,000
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 | $ 0 |  |  | 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 | $ 204,000,000 |  |  |
Long-term Debt | $ 0 |  |  | 204,000,000
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 | $ 0 |  |  | 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 | $ 171,000,000 |  |  |
Long-term Debt | $ 0 |  |  | 171,000,000
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 | € |  | € 846,000,000 |  |
Long-term Debt | $ 980,000,000 |  |  | 1,039,000,000
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 | $ 453,000,000 |  |  |
Long-term Debt | $ 453,000,000 |  |  | 453,000,000
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 | $ 496,000,000 |  |  | 503,000,000
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 | € |  | € 54,000,000 |  |
Long-term Debt | $ 63,000,000 |  |  | 64,000,000
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 | $ 487,000,000 |  |  |
Long-term Debt | $ 510,000,000 |  |  | 516,000,000
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 | $ 51,000,000 |  |  | 51,000,000
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 | $ 342,000,000 |  |  |
Long-term Debt | $ 339,000,000 |  |  | 339,000,000
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 | $ 190,000,000 |  |  |
Long-term Debt | $ 189,000,000 |  |  | 189,000,000
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 | $ 6,000,000 |  |  |
Long-term Debt | $ 6,000,000 |  |  | 6,000,000
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 | $ 155,000,000 |  |  |
Long-term Debt | $ 155,000,000 |  |  | 155,000,000
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 | $ 444,000,000 |  |  |
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 | $ 477,000,000 |  |  |
Long-term Debt | $ 560,000,000 |  |  | 564,000,000
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 | $ 22,000,000 |  |  | 22,000,000
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 | $ 32,000,000 |  |  |
Long-term Debt | $ 32,000,000 |  |  | 32,000,000
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 |  |  | 496,000,000
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 | $ 341,000,000 |  |  |
Long-term Debt | $ 340,000,000 |  |  | 340,000,000
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 | ¥ |  |  | ¥ 25,000,000,000 |
Long-term Debt | $ 223,000,000 |  |  | 237,000,000
Zero Point Three Seven Five Percent Due Two Thousand Twenty Seven | Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.375% | 0.375% | 0.375% |
Debt instrument, face amount | € |  | € 500,000,000 |  |
Long-term Debt | $ 577,000,000 |  |  | 583,000,000
One Point Seven Five Percent Due Two Thousand Thirty | Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.75% | 1.75% | 1.75% |
Debt instrument, face amount | $ 625,000,000 |  |  |
Long-term Debt | $ 623,000,000 |  |  | 623,000,000
One Point Zero Percent Due Two Thousand Thirty Two | Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.00% | 1.00% | 1.00% |
Debt instrument, face amount | € |  | € 500,000,000 |  |
Long-term Debt | $ 578,000,000 |  |  | 584,000,000
Two Point Zero Percent Due Two Thousand Thirty One | Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.00% | 2.00% | 2.00% |
Debt instrument, face amount | $ 500,000,000 |  |  |
Long-term Debt | $ 496,000,000 |  |  | $ 0

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