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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2014
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping
The following table presents the carrying value and estimated fair value of the Company's long-term debt (in millions):
 
As of June 30, 2014
 
As of December 31, 2013
 
Carrying
 
Fair
 
Carrying
 
Fair
 
Value
 
Value
 
Value
 
Value
 
 
 
 
 
 
 
 
Long-term debt
$
1,176

 
$
1,291

 
$
1,176

 
$
1,270