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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
 3 Months Ended
Dec. 31, 2020
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 $ 111 $ 87
Derivative liabilities $ 3,183 $ 3,020
Equity swap    
Derivative Instruments [Line Items]    
Derivative, amount of hedged ordinary shares | shares 1.4 1.4
Derivative, Amount of Hedged Item $ 58 $ 58
Copper [Member]    
Derivative Instruments [Line Items]    
Derivative, Nonmonetary Notional Amount | T 2,588 2,497
Aluminum [Member]    
Derivative Instruments [Line Items]    
Derivative, Nonmonetary Notional Amount | T 2,438 3,036
Designated as Hedging Instrument    
Derivative Instruments [Line Items]    
Derivative assets $ 22 $ 12
Derivative liabilities 3,162 3,020
Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives    
Derivative Instruments [Line Items]    
Derivative assets 19 10
Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives    
Derivative Instruments [Line Items]    
Derivative assets 3 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 16 10
Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member]    
Derivative Instruments [Line Items]    
Derivative liabilities 3,146 3,010
Not Designated as Hedging Instrument    
Derivative Instruments [Line Items]    
Derivative assets 89 75
Derivative liabilities 21 0
Not Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives    
Derivative Instruments [Line Items]    
Derivative assets 25 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 64 58
Not Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives    
Derivative Instruments [Line Items]    
Derivative liabilities 21 0
Not Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member]    
Derivative Instruments [Line Items]    
Derivative liabilities $ 0 $ 0