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Financial Instruments - Reconciliation of Changes in Fair Value (Details) - Level 3 - Foreign currency option contracts - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, beginning of period $ 0 $ 3
Purchases, issuances, sales and settlements:    
Purchases 0 0
Settlements 0 0
Transfer in and / or out of Level 3 0 0
Reclass between short-term and long-term 0 0
Fair Value, end of period 0 3
Short-term    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, beginning of period 0 2
Purchases, issuances, sales and settlements:    
Purchases 0 0
Settlements 0 0
Transfer in and / or out of Level 3 0 0
Reclass between short-term and long-term 0 0
Fair Value, end of period 0 2
Long-term    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, beginning of period 0 1
Purchases, issuances, sales and settlements:    
Purchases 0 0
Settlements 0 0
Transfer in and / or out of Level 3 0 0
Reclass between short-term and long-term 0 0
Fair Value, end of period 0 1
Included in other income    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) 0 0
Total realized gains (losses) 0 0
Included in other income | Short-term    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) 0 0
Total realized gains (losses) 0 0
Included in other income | Long-term    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) 0 0
Total realized gains (losses) 0 0
Included in cost of sales    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) 0 0
Total realized gains (losses) 0 0
Included in cost of sales | Short-term    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) 0 0
Total realized gains (losses) 0 0
Included in cost of sales | Long-term    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) 0 0
Total realized gains (losses) $ 0 $ 0