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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, 2020
USD ($)
T
shares
Sep. 30, 2019
USD ($)
T
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, amount of hedged ordinary shares | shares 1.4  
Derivative assets $ 65 $ 97
Derivative liabilities 2,609 $ 2,568
Equity swap    
Derivative Instruments [Line Items]    
Derivative, Amount of Hedged Item $ 60  
Copper [Member]    
Derivative Instruments [Line Items]    
Derivative, Nonmonetary Notional Amount | T 3,719 3,561
Aluminum [Member]    
Derivative Instruments [Line Items]    
Derivative, Nonmonetary Notional Amount | T 2,921 2,967
Other Current Liabilities | Commodity Derivatives    
Derivative Instruments [Line Items]    
Derivative liabilities   $ 1
Liabilities Held for Sale, Current [Member] | Commodity Derivatives    
Derivative Instruments [Line Items]    
Derivative liabilities $ 4  
Designated as Hedging Instrument    
Derivative Instruments [Line Items]    
Derivative assets 14 16
Derivative liabilities 2,582 2,568
Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives    
Derivative Instruments [Line Items]    
Derivative assets 14 16
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 22 23
Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives    
Derivative Instruments [Line Items]    
Derivative liabilities 4 1
Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member]    
Derivative Instruments [Line Items]    
Derivative liabilities 2,556 2,544
Not Designated as Hedging Instrument    
Derivative Instruments [Line Items]    
Derivative assets 51 81
Derivative liabilities 27 0
Not Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives    
Derivative Instruments [Line Items]    
Derivative assets 13 19
Not Designated as Hedging Instrument | Other Noncurrent Assets | Equity swap    
Derivative Instruments [Line Items]    
Derivative assets 38 62
Not Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives    
Derivative Instruments [Line Items]    
Derivative liabilities 27 0
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