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Other Financial Information (Tables)
3 Months Ended
Mar. 31, 2015
Additional Financial Information Disclosure [Abstract]  
Schedule of other current assets reflected on the entity's balance sheet
The following table presents details of other current assets in our consolidated balance sheets:
 
As of March 31, 2015
 
As of December 31, 2014
 
(Dollars in millions)
Prepaid expenses
$
63

 
45

Other
83

 
80

Total other current assets
$
146

 
125

Schedule of accounts payable
The following table presents selected current liabilities reflected in our consolidated balance sheets, which include accounts payable:
 
As of March 31, 2015
 
As of December 31, 2014
 
(Dollars in millions)
Accounts payable
$
482

 
464