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Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments [Line Items]    
Total assets $ 15 $ 22
Derivative liabilities 3,631 3,450
Derivatives and Hedging Activities Designated as Hedging Instruments    
Derivative Instruments [Line Items]    
Total assets 15 21
Derivative liabilities 3,617 3,449
Derivatives and Hedging Activities Designated as Hedging Instruments | Other current assets | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Total assets 14 19
Derivatives and Hedging Activities Designated as Hedging Instruments | Other current assets | Commodity derivatives    
Derivative Instruments [Line Items]    
Total assets 1 2
Derivatives and Hedging Activities Designated as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Derivative liabilities 9 24
Derivatives and Hedging Activities Designated as Hedging Instruments | Other current liabilities | Commodity derivatives    
Derivative Instruments [Line Items]    
Derivative liabilities 1 1
Derivatives and Hedging Activities Designated as Hedging Instruments | Long-term debt | Foreign currency denominated debt    
Derivative Instruments [Line Items]    
Derivative liabilities 3,607 3,424
Derivatives and Hedging Activities Not Designated as Hedging Instruments    
Derivative Instruments [Line Items]    
Total assets 0 1
Derivative liabilities 14 1
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Other current assets | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Total assets 0 1
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Other current assets | Commodity derivatives    
Derivative Instruments [Line Items]    
Total assets 0 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Derivative liabilities 14 1
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Other current liabilities | Commodity derivatives    
Derivative Instruments [Line Items]    
Derivative liabilities 0 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Long-term debt | Foreign currency denominated debt    
Derivative Instruments [Line Items]    
Derivative liabilities $ 0 $ 0