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Derivative Financial Instruments - Effect of Derivative Instruments (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Designated as Hedging Instrument | Fair Value Hedges | Interest expense    
Derivative Financial Instruments    
Gain (loss) recognized from interest rate swaps $ 1 $ 2
Designated as Hedging Instrument | Cash Flow Hedges | AOCL    
Derivative Financial Instruments    
Amount of (loss) recognized in AOCL (effective portion, before deferred tax impact) (2) (4)
Designated as Hedging Instrument | Cash Flow Hedges | Cost of sales    
Derivative Financial Instruments    
Amount of gain (loss) reclassified from AOCL into income 1 (1)
Not Designated as Hedging Instrument | Cost of sales    
Derivative Financial Instruments    
Gain (loss) recognized from foreign currency forward exchange contracts $ (4) $ (1)