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Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Detail) shares in Millions, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) T shares | Sep. 30, 2021 USD ($) T shares | Apr. 30, 2021 USD ($)
Derivative Instruments [Line Items] |  |  |
Hedge Percentage For Foreign Exchange Transactional Exposures Minimum | 70.00% |  |
Hedge Percentage For Foreign Exchange Transactional Exposures Maximum | 90.00% |  |
Derivative assets | $ 64 | $ 57 |
Derivative liabilities | $ 2,637 | $ 2,936 |
Interest Rate Swaps |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative, Notional Amount |  |  | $ 500
Copper [Member] |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | T | 3,382 | 2,656 |
Aluminum [Member] |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | T | 6,942 | 5,159 |
Equity swap |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative, amount of hedged ordinary shares | shares | 0.0 | 0.3 |
Derivative, Amount of Hedged Item |  | $ 23 |
Designated as Hedging Instrument |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative assets | $ 22 | 17 |
Derivative liabilities | 2,624 | 2,930 |
Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative assets | 22 | 15 |
Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative assets | 0 | 2 |
Designated as Hedging Instrument | Other Noncurrent Assets | Equity swap |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative assets | 0 | 0 |
Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative liabilities | 11 | 11 |
Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative liabilities | 10 | 1 |
Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member] |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative liabilities | 2,603 | 2,918 |
Not Designated as Hedging Instrument |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative assets | 42 | 40 |
Derivative liabilities | 13 | 6 |
Not Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative assets | 42 | 17 |
Not Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative assets | 0 | 0 |
Not Designated as Hedging Instrument | Other Noncurrent Assets | Equity swap |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative assets | 0 | 23 |
Not Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative liabilities | 13 | 6 |
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative liabilities | 0 | 0 |
Not Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member] |  |  |
Derivative Instruments [Line Items] |  |  |
Derivative liabilities | $ 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 Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  | $ 500 |

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