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Derivatives - Additional Information (Detail)
12 Months Ended
Sep. 30, 2017
USD ($)
Derivative
Sep. 30, 2016
USD ($)
Derivative
Sep. 30, 2015
USD ($)
Derivative [Line Items]      
Significant concentration of credit risk associated with our derivative instruments $ 0    
Loss on foreign currency translation adjustment (25,000,000) $ (7,000,000) $ 270,000,000
Cross Currency Swaps [Member]      
Derivative [Line Items]      
Net investment hedge, ineffectiveness 0 0  
Cross Currency Swaps [Member] | Other Assets [Member]      
Derivative [Line Items]      
Fair value of swaps   $ 1,000,000  
Cross Currency Swaps [Member] | Prepaid Expenses And Other Asset Current And Other Liabilities [Member]      
Derivative [Line Items]      
Fair value of swaps, net liability $ 13,000,000    
Fair Value Hedging [Member] | Interest Rate Swap-Fixed to Variable [Member] | Interest Rate Risk [Member]      
Derivative [Line Items]      
Derivatives held to manage interest rate risk | Derivative 0 0  
Net Investment Hedge [Member] | Cross Currency Swaps [Member]      
Derivative [Line Items]      
Notional amount   $ 250,000,000  
Net cash interest received $ 4,000,000    
Loss on foreign currency translation adjustment 10,000,000    
Cumulative gain (loss) related to swaps (9,000,000) 1,000,000  
Gains or losses reclassified from accumulated other comprehensive income (loss) into earnings $ 0 $ 0