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Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Derivative [Line Items]    
Total assets $ 42 $ 22
Total liabilities 3,802 3,450
Derivatives and Hedging Activities  Designated as Hedging Instruments    
Derivative [Line Items]    
Total assets 42 21
Total liabilities 3,215 3,449
Derivatives and Hedging Activities Not Designated as Hedging Instruments    
Derivative [Line Items]    
Total assets 0 1
Total liabilities 587 1
Other current assets | Foreign currency exchange derivatives | Derivatives and Hedging Activities  Designated as Hedging Instruments    
Derivative [Line Items]    
Total assets 42 19
Other current assets | Foreign currency exchange derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments    
Derivative [Line Items]    
Total assets 0 1
Other current assets | Interest rate swaps | Derivatives and Hedging Activities  Designated as Hedging Instruments    
Derivative [Line Items]    
Total assets 0 2
Other current assets | Interest rate swaps | Derivatives and Hedging Activities Not Designated as Hedging Instruments    
Derivative [Line Items]    
Total assets 0 0
Other current liabilities | Foreign currency exchange derivatives | Derivatives and Hedging Activities  Designated as Hedging Instruments    
Derivative [Line Items]    
Total liabilities 26 24
Other current liabilities | Foreign currency exchange derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments    
Derivative [Line Items]    
Total liabilities 66 1
Other current liabilities | Commodity derivatives | Derivatives and Hedging Activities  Designated as Hedging Instruments    
Derivative [Line Items]    
Total liabilities 3 1
Other current liabilities | Commodity derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments    
Derivative [Line Items]    
Total liabilities 0 0
Long-term debt | Foreign currency denominated debt | Derivatives and Hedging Activities  Designated as Hedging Instruments    
Derivative [Line Items]    
Total liabilities 3,186 3,424
Long-term debt | Foreign currency denominated debt | Derivatives and Hedging Activities Not Designated as Hedging Instruments    
Derivative [Line Items]    
Total liabilities $ 521 $ 0