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Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Sep. 30, 2022
Derivative [Line Items]    
Total assets $ 48 $ 54
Total liabilities 3,419 3,138
Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815    
Derivative [Line Items]    
Total assets 14 30
Total liabilities 3,398 3,111
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815    
Derivative [Line Items]    
Total assets 34 24
Total liabilities 21 27
Other current assets | Foreign currency exchange derivatives | Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815    
Derivative [Line Items]    
Total assets 14 30
Other current assets | Foreign currency exchange derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815    
Derivative [Line Items]    
Total assets 34 24
Other current liabilities | Foreign currency exchange derivatives | Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815    
Derivative [Line Items]    
Total liabilities 18 24
Other current liabilities | Foreign currency exchange derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815    
Derivative [Line Items]    
Total liabilities 21 27
Other current liabilities | Commodity derivatives | Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815    
Derivative [Line Items]    
Total liabilities 4 10
Other current liabilities | Commodity derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815    
Derivative [Line Items]    
Total liabilities 0 0
Long-term debt | Foreign currency denominated debt | Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815    
Derivative [Line Items]    
Total liabilities 3,376 3,077
Long-term debt | Foreign currency denominated debt | Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815    
Derivative [Line Items]    
Total liabilities $ 0 $ 0