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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, 2024
Sep. 30, 2023
Derivative Instruments [Line Items]    
Total assets $ 22 $ 56
Total liabilities 3,450 3,280
Designated  as Hedging Instruments    
Derivative Instruments [Line Items]    
Total assets 21 43
Total liabilities 3,449 3,275
Designated  as Hedging Instruments | Other current assets | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Total assets 19 16
Designated  as Hedging Instruments | Other current assets | Commodity derivatives    
Derivative Instruments [Line Items]    
Total assets 2 0
Designated  as Hedging Instruments | Other current assets | Interest rate swaps    
Derivative Instruments [Line Items]    
Total assets 0 22
Designated  as Hedging Instruments | Other noncurrent assets | Cross-currency interest rate swap    
Derivative Instruments [Line Items]    
Total assets 0 5
Designated  as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Total liabilities 24 20
Designated  as Hedging Instruments | Other current liabilities | Commodity derivatives    
Derivative Instruments [Line Items]    
Total liabilities 1 2
Designated  as Hedging Instruments | Long-term debt | Foreign currency denominated debt    
Derivative Instruments [Line Items]    
Total liabilities 3,424 3,253
Not Designated as Hedging Instruments    
Derivative Instruments [Line Items]    
Total assets 1 13
Total liabilities 1 5
Not Designated as Hedging Instruments | Other current assets | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Total assets 1 13
Not Designated as Hedging Instruments | Other current assets | Commodity derivatives    
Derivative Instruments [Line Items]    
Total assets 0 0
Not Designated as Hedging Instruments | Other current assets | Interest rate swaps    
Derivative Instruments [Line Items]    
Total assets 0 0
Not Designated as Hedging Instruments | Other noncurrent assets | Cross-currency interest rate swap    
Derivative Instruments [Line Items]    
Total assets 0 0
Not Designated as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Total liabilities 1 5
Not Designated as Hedging Instruments | Other current liabilities | Commodity derivatives    
Derivative Instruments [Line Items]    
Total liabilities 0 0
Not Designated as Hedging Instruments | Long-term debt | Foreign currency denominated debt    
Derivative Instruments [Line Items]    
Total liabilities $ 0 $ 0