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Fair Value Disclosure
12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Fair Value Disclosure
Fair Value Disclosure
Our financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable and long-term debt, excluding capital lease obligations. Due to their short-term nature, the carrying amounts of our cash and cash equivalents, accounts receivable and accounts payable approximate their fair values.
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between independent and knowledgeable parties who are willing and able to transact for an asset or liability at the measurement date. We use valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs when determining fair value and then we rank the estimated values based on the reliability of the inputs used following the fair value hierarchy set forth by the FASB.
We determined the fair values of our long-term debt, including the current portion, based on quoted market prices where available or, if not available, based on discounted future cash flows using current market interest rates.
The three input levels in the hierarchy of fair value measurements are defined by the FASB generally as follows:
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.

The following table presents the carrying amounts and estimated fair values of our long-term debt, excluding capital lease and other obligations, as well as the input levels used to determine the fair values indicated below:
 
 
 
 
As of December 31, 2014
 
As of December 31, 2013
 
 
Input
Level
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
 
 
 
 
(Dollars in millions)
Liabilities-Long-term debt excluding capital lease and other obligations
 
2
 
$
20,162

 
21,255

 
20,347

 
20,413