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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, 2021
Sep. 30, 2020
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets $ 57 $ 87
Gross amount, derivative liabilities 2,936 3,020
Designated as Hedging Instrument    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 17 12
Gross amount, derivative liabilities 2,930 3,020
Designated as Hedging Instrument | Other current assets | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 15 10
Designated as Hedging Instrument | Other current assets | Commodity derivatives    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 2 2
Designated as Hedging Instrument | Other noncurrent assets | Equity swap    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 0 0
Designated as Hedging Instrument | Other current liabilities | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Gross amount, derivative liabilities 11 10
Designated as Hedging Instrument | Other current liabilities | Commodity derivatives    
Derivative Instruments [Line Items]    
Gross amount, derivative liabilities 1 0
Designated as Hedging Instrument | Long-term debt | Foreign Currency Denominated Debt [Member]    
Derivative Instruments [Line Items]    
Gross amount, derivative liabilities 2,918 3,010
Not Designated as Hedging Instrument    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 40 75
Gross amount, derivative liabilities 6 0
Not Designated as Hedging Instrument | Other current assets | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 17 17
Not Designated as Hedging Instrument | Other current assets | Commodity derivatives    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 0 0
Not Designated as Hedging Instrument | Other noncurrent assets | Equity swap    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 23 58
Not Designated as Hedging Instrument | Other current liabilities | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Gross amount, derivative liabilities 6 0
Not Designated as Hedging Instrument | Other current liabilities | Commodity derivatives    
Derivative Instruments [Line Items]    
Gross amount, derivative liabilities 0 0
Not Designated as Hedging Instrument | Long-term debt | Foreign Currency Denominated Debt [Member]    
Derivative Instruments [Line Items]    
Gross amount, derivative liabilities $ 0 $ 0