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Fair Value Measurements - Summary of Fair Values of Outstanding Foreign Currency Derivatives (Details) - Foreign Exchange Contract [Member] - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Accounts Receivable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivative assets $ 2 $ 11
Notional contract values 399 1,209
Accrued Expenses and Other Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional contract values 304 755
Foreign currency derivative liabilities $ 1 $ 3