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Fair Value Disclosure (Tables)
9 Months Ended
Sep. 30, 2012
Fair Value Disclosure  
Schedule of the three input levels in the hierarchy of fair value measurements
Input Level
  Description of Input
Level 1   Observable inputs such as quoted market prices in active markets.
Level 2   Inputs other than quoted prices in active markets that are either directly or indirectly observable.
Level 3   Unobservable inputs in which little or no market data exists.
Schedule of carrying amounts and estimated fair values of long-term debt, excluding capital lease obligations, and input levels to determine fair values

   
  Successor  
 
   
  September 30, 2012   December 31, 2011  
 
  Input
Level
  Carrying
Amount
  Fair
Value
  Carrying
Amount
  Fair
Value
 
 
   
  (Dollars in millions)
 

Liabilities—Long-term debt excluding capital lease obligations

    2   $ 7,527     8,044     8,149     8,352