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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
 6 Months Ended
Mar. 31, 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 $ 79 $ 57  
Derivative liabilities $ 2,829 $ 2,936  
Interest Rate Swaps      
Derivative Instruments [Line Items]      
Derivative, Notional Amount     $ 500
Copper [Member]      
Derivative Instruments [Line Items]      
Derivative, Nonmonetary Notional Amount | T 3,496 2,656  
Aluminum [Member]      
Derivative Instruments [Line Items]      
Derivative, Nonmonetary Notional Amount | T 7,310 5,159  
Equity swap      
Derivative Instruments [Line Items]      
Derivative, amount of hedged ordinary shares | shares 0.3 0.3  
Derivative, Amount of Hedged Item $ 23 $ 23  
Designated as Hedging Instrument      
Derivative Instruments [Line Items]      
Derivative assets 38 17  
Derivative liabilities 2,804 2,930  
Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives      
Derivative Instruments [Line Items]      
Derivative assets 29 15  
Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives      
Derivative Instruments [Line Items]      
Derivative assets 9 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 9 11  
Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives      
Derivative Instruments [Line Items]      
Derivative liabilities 0 1  
Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member]      
Derivative Instruments [Line Items]      
Derivative liabilities 2,795 2,918  
Not Designated as Hedging Instrument      
Derivative Instruments [Line Items]      
Derivative assets 41 40  
Derivative liabilities 25 6  
Not Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives      
Derivative Instruments [Line Items]      
Derivative assets 19 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 22 23  
Not Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives      
Derivative Instruments [Line Items]      
Derivative liabilities 25 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