Fair Value Disclosure

3 Months Ended

Mar. 31, 2012

Fair Value Disclosure

Fair Value Disclosure

(8)   Fair Value Disclosure

        Our financial instruments consist of cash and cash equivalents, accounts receivable, investments, accounts payable and long-term debt, excluding capital lease obligations. 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.

        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 Financial Accounting Standards Board 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 investment securities, which are reported in noncurrent other assets, and long-term debt, excluding capital lease obligations, as well as the input levels used to determine the fair values:

			March 31, 2012				December 31, 2011
	Input Level		Carrying Amount		Fair Value		Carrying Amount		Fair Value
			(Dollars in millions)
Assets—Investments securities		3	$	59		59		73		73
Liabilities—Long-term debt excluding capital lease obligations		2		22,056		23,093		21,124		22,052

        Our investment securities consist of auction rate securities maturing in 2033 and 2035 that are not actively traded in liquid markets. We have designated these securities as available for sale and, accordingly, we report them on our balance sheet under our "goodwill and other assets—other" line item at fair value on a recurring basis. We estimated the fair value of these securities at March 31, 2012 using a probability-weighted cash flow model that considers the coupon rate for the securities, probabilities of default and liquidation prior to maturity, and a discount rate commensurate with the creditworthiness of the issuer. On January 24, 2012, we sold $17 million of these securities, which resulted in an immaterial gain.