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Stockholders' Equity (Tables)
 6 Months Ended
Mar. 31, 2013
Equity [Abstract]  
Schedule of Activity in Noncontrolling Interest

The following table illustrates the noncontrolling interests activity for the periods presented:

 

     2013     2012  
     (Dollars in millions)  

Balance at September 30

    $ 126     $ 129  

Net income attributable to noncontrolling interests, net of tax

      —          10  

Noncontrolling interests foreign currency translation adjustment

      —          1  

Contribution from noncontrolling interests

      9       4  

Noncontrolling interests dividends

      (13 )      (12 ) 
  

 

 

    

 

 

  

Balance at March 31

    $ 122     $ 132