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Financial Instruments and Fair Value Measurements (Tables)
 9 Months Ended
Jun. 30, 2013
Text Block [Abstract]  
Schedule of Fair Value of Derivatives, Net of Legal Right to Offset Derivative Settlements

The derivatives presented in the table below are presented by derivative type, net of the legal right to offset derivative settlements by each counterparty:

 

     June 30, 2013      September 30, 2012  
     Level 2 Inputs      Level 2 Inputs  
     (Dollars in millions)  

Assets at fair value:

      

Guaranteed investment contract(1)

    $ 14      $ 14  

Derivatives relating to foreign currency(2)

      1        —     

Derivatives relating to interest rates(2)

      —           2  
  

 

 

     

 

 

  

Total assets at fair value

    $ 15      $ 16  
  

 

 

     

 

 

  

Liabilities at fair value:

      

Derivatives relating to foreign currency(2)

    $ 29      $ 28  

Hedged long-term debt(3)

      35        36  
  

 

 

     

 

 

  

Total liabilities at fair value

    $ 64      $ 64  
  

 

 

     

 

 

  

 

(1) 

Included in “Other assets” in the Consolidated Balance Sheets.
(2) 

Included in “Prepaid expenses and other current assets” or “Accounts payable and accrued liabilities” in the Consolidated Balance Sheets.
(3)

Included in “Current portion of long-term debt” in the Consolidated Balance Sheets.