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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, 2022
Sep. 30, 2021
Derivative Instruments [Line Items]    
Total assets $ 54 $ 57
Total liabilities 3,138 2,936
Designated  as Hedging Instruments    
Derivative Instruments [Line Items]    
Total assets 30 17
Total liabilities 3,111 2,930
Designated  as Hedging Instruments | Other current assets | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Total assets 30 15
Designated  as Hedging Instruments | Other current assets | Commodity derivatives    
Derivative Instruments [Line Items]    
Total assets 0 2
Designated  as Hedging Instruments | Other noncurrent assets | Equity swap    
Derivative Instruments [Line Items]    
Total assets 0 0
Designated  as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Total liabilities 24 11
Designated  as Hedging Instruments | Other current liabilities | Commodity derivatives    
Derivative Instruments [Line Items]    
Total liabilities 10 1
Designated  as Hedging Instruments | Long-term debt | Foreign currency denominated debt    
Derivative Instruments [Line Items]    
Total liabilities 3,077 2,918
Not Designated as Hedging Instruments    
Derivative Instruments [Line Items]    
Total assets 24 40
Total liabilities 27 6
Not Designated as Hedging Instruments | Other current assets | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Total assets 24 17
Not Designated as Hedging Instruments | Other current assets | Commodity derivatives    
Derivative Instruments [Line Items]    
Total assets 0 0
Not Designated as Hedging Instruments | Other noncurrent assets | Equity swap    
Derivative Instruments [Line Items]    
Total assets 0 23
Not Designated as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Total liabilities 27 6
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