Fair Value Measurements

9 Months Ended

Sep. 30, 2011


13.	Fair Value Measurements

Assets and Liabilities Accounted for at Fair Value

Our assets and liabilities that are measured at fair value on a recurring basis include the following (in millions):


			Fair Value Measurements at
			September 30, 2011 Using
			Quoted		Significant
			Prices in		Other		Significant
			Active		Observable		Unobservable
			Markets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)

Assets:
Cash equivalents	$	185	$	185	$	—	$	—
Available-for-sale securities		162		162		—		—
Interest rate derivatives		75		—		75		—
Foreign currency derivatives		8		—		8		—
Electricity commodity derivatives		1		—		1		—

Total assets	$	431	$	347	$	84	$	—

Liabilities:
Interest rate derivatives	$	68	$	—	$	68	$	—
Electricity commodity derivatives		1		—		1		—

Total liabilities	$	69	$	—	$	69	$	—


			Fair Value Measurements at
			December 31, 2010 Using
			Quoted		Significant
			Prices in		Other		Significant
			Active		Observable		Unobservable
			Markets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)

Assets:
Cash equivalents	$	468	$	468	$	—	$	—
Available-for-sale securities		148		148		—		—
Interest rate derivatives		38		—		38		—

Total assets	$	654	$	616	$	38	$	—

Liabilities:
Interest rate derivatives	$	24	$	—	$	24	$	—
Foreign currency derivatives		3		—		3		—
Electricity commodity derivatives		1		—		1		—

Total liabilities	$	28	$	—	$	28	$	—

Fair Value of Debt

At September 30, 2011, the carrying value of our debt was approximately $9.6 billion compared with $8.9 billion at December 31, 2010. The carrying value of our debt includes adjustments for both the unamortized fair value adjustments related to terminated hedge arrangements and fair value adjustments of debt instruments that are currently hedged.

The estimated fair value of our debt was approximately $10.6 billion at September 30, 2011 and approximately $9.2 billion at December 31, 2010. The estimated fair value of our senior notes is based on quoted market prices. The carrying value of remarketable debt approximates fair value due to the short-term nature of the interest rates. The fair value of our other debt is estimated using discounted cash flow analysis, based on rates we would currently pay for similar types of instruments. The increase in the fair value of our debt when comparing September 30, 2011 with December 31, 2010 is primarily related to $753 million of net borrowings during 2011 associated with our senior notes. Increases in market prices for corporate debt securities and decreases in current market rates on fixed-rate tax-exempt bonds also contributed to the increase in the fair value of debt for the reported period.

Although we have determined the estimated fair value amounts using available market information and commonly accepted valuation methodologies, considerable judgment is required in interpreting market data to develop the estimates of fair value. Accordingly, our estimates are not necessarily indicative of the amounts that we, or holders of the instruments, could realize in a current market exchange. The use of different assumptions and/or estimation methodologies could have a material effect on the estimated fair values. The fair value estimates are based on information available as of September 30, 2011 and December 31, 2010. These amounts have not been revalued since those dates, and current estimates of fair value could differ significantly from the amounts presented.

- Definition

This item represents the complete disclosure regarding the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the Company is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risk is are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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