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Derivative Instruments and Hedging Activities Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($)
shares in Millions, $ in Millions
Sep. 30, 2019
Sep. 30, 2018
Derivative Instruments [Line Items]    
Derivative, amount of hedged ordinary shares 1.4 1.8
Gross amount recognized, derivative assets $ 97 $ 80
Gross amount, derivative liabilities 2,568 3,175
Equity swap    
Derivative Instruments [Line Items]    
Derivative, Amount of Hedged Item 60 73
Designated as Hedging Instrument    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 16 7
Gross amount, derivative liabilities 2,568 3,173
Designated as Hedging Instrument | Other current assets | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 16 6
Designated as Hedging Instrument | Other current assets | Commodity derivatives    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 0 1
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 23 10
Designated as Hedging Instrument | Other current liabilities | Commodity derivatives    
Derivative Instruments [Line Items]    
Gross amount, derivative liabilities 1 2
Designated as Hedging Instrument | Liabilities Held for Sale, Current [Member] | Commodity derivatives    
Derivative Instruments [Line Items]    
Gross amount, derivative liabilities 0 12
Designated as Hedging Instrument | Long-term debt | Foreign Currency Denominated Debt [Member]    
Derivative Instruments [Line Items]    
Gross amount, derivative liabilities 2,544 3,149
Not Designated as Hedging Instrument    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 81 73
Gross amount, derivative liabilities 0 2
Not Designated as Hedging Instrument | Other current assets | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Gross amount recognized, derivative assets 19 10
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 62 63
Not Designated as Hedging Instrument | Other current liabilities | Foreign currency exchange derivatives    
Derivative Instruments [Line Items]    
Gross amount, derivative liabilities 0 2
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 | Liabilities Held for Sale, Current [Member] | 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