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Derivative Instruments and Hedging Activities Derivatives, Additional Information (Details) € in Millions, shares in Millions, ¥ in Billions | 12 Months Ended
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Sep. 30, 2021 USD ($) shares | Sep. 30, 2021 EUR (€) | Sep. 30, 2021 JPY (¥) | Sep. 30, 2020 USD ($) shares | Sep. 30, 2020 EUR (€) | Sep. 30, 2020 JPY (¥) | Sep. 30, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Hedge percentage for foreign exchange transactional exposures, Minimum | 70.00% | 70.00% | 70.00% |  |  |  |
Hedge percentage for foreign exchange transactional exposures, Maximum | 90.00% | 90.00% | 90.00% |  |  |  |
Derivative, amount of hedged ordinary shares | shares | 0.3 |  |  | 1.4 |  |  |
Pre-tax gains (losses) related to net investment hedges reclassified from other comprehensive income | $ 0 |  |  | $ 0 |  |  | $ 0
Two Point Zero Percent Due Two Thousand Thirty One | Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | 500,000,000 |  |  |  |  |  |
Interest rate swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount | 500,000,000 |  |  |  |  |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount of Nonderivative Instruments |  | € 2,300 | ¥ 25 |  | € 2,400 | ¥ 25 |
Equity swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Amount of Hedged Item | 23,000,000 |  |  | 60,000,000 |  |  |
Net Investment Hedging [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Pre-tax gains (losses) related to net investment hedges recorded in other comprehensive income | $ 42,000,000 |  |  | $ (172,000,000) |  |  | $ 145,000,000

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