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Financial Instruments (Fair Value Measurements) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Derivatives, Fair Value [Line Items]    
Fair value of long-term debt compared with carrying value $ 150  
Maximum collateral that could have been required 23  
Collateral posted to counterparties 0  
Collateral held from counterparties 0  
Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of long-term debt 3,600  
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Assets [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 14 $ 35
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 21 11
Cash Flow Hedging [Member] | Commodity Contract [Member] | Assets [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 0 1
Cash Flow Hedging [Member] | Commodity Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities $ 14 $ 10