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Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Detail)
shares in Thousands, $ in Millions
 6 Months Ended
Mar. 31, 2021
USD ($)
T
shares
Sep. 30, 2020
USD ($)
T
shares
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 $ 162 $ 87
Derivative liabilities $ 3,012 $ 3,020
Copper [Member]    
Derivative Instruments [Line Items]    
Derivative, Nonmonetary Notional Amount | T 2,783 2,497
Aluminum [Member]    
Derivative Instruments [Line Items]    
Derivative, Nonmonetary Notional Amount | T 3,133 3,036
Equity swap    
Derivative Instruments [Line Items]    
Derivative, amount of hedged ordinary shares | shares 1,400 1,400
Derivative, Amount of Hedged Item $ 58 $ 60
Designated as Hedging Instrument    
Derivative Instruments [Line Items]    
Derivative assets 23 12
Derivative liabilities 3,009 3,020
Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives    
Derivative Instruments [Line Items]    
Derivative assets 3 2
Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives    
Derivative Instruments [Line Items]    
Derivative assets 20 10
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 7 10
Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member]    
Derivative Instruments [Line Items]    
Derivative liabilities 3,002 3,010
Not Designated as Hedging Instrument    
Derivative Instruments [Line Items]    
Derivative assets 139 75
Derivative liabilities 3 0
Not Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives    
Derivative Instruments [Line Items]    
Derivative assets 0 0
Not Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives    
Derivative Instruments [Line Items]    
Derivative assets 57 17
Not Designated as Hedging Instrument | Other Noncurrent Assets | Equity swap    
Derivative Instruments [Line Items]    
Derivative assets 82 58
Not Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives    
Derivative Instruments [Line Items]    
Derivative liabilities 3 0
Not Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member]    
Derivative Instruments [Line Items]    
Derivative liabilities $ 0 $ 0