Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value Measurements (Tables) [Abstract]

Fair value of assets and liabilities measured on a recurring basis

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


			Fair Value Measurements at
			June 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	$	326	$	326	$	—	$	—
Available-for-sale securities		142		142		—		—
Interest rate derivatives		50		—		50		—

Total assets	$	518	$	468	$	50	$	—

Liabilities:
Electricity commodity derivatives	$	2	$	—	$	2	$	—
Interest rate derivatives		22		—		22		—
Foreign currency derivatives		17		—		17		—

Total liabilities	$	41	$	—	$	41	$	—


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

Total liabilities	$	28	$	—	$	28	$	—

- Definition

This element represents the disclosure related to the fair value measurement of assets and liabilities which includes [financial] instruments measured at fair value that are classified in stockholders' equity. Such assets and liabilities may be measured on a recurring or nonrecurring basis. The disclosures which may be required or desired include: (1) for assets and liabilities measured on a recurring basis, disclosure may include: (a) the fair value measurements at the reporting date; (b) the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3); (c) for fair value measurements using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (i) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (ii) purchases, sales, issuances, and settlements (net); (iii) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs); (d) the amount of the total gains or losses for the period in subparagraph (c) (i) above included in earnings (or changes in net assets) that are attributable to the change in unrealized gains or losses relating to those assets and liabilities still held at the reporting date and a description of where those unrealized gains or losses are reported in the statement of income (or activities); (e) the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period and (2) for assets and liabilities that are measured at fair value on a nonrecurring basis (for example, impaired assets) disclosure may include, in addition to (a) above: (a) the reasons for the fair value measurements recorded; (b) the same as (b) above; (c) for fair value measurements using significant unobservable inputs (Level 3), a description of the inputs and the information used to develop the inputs; and (d) the valuation technique(s) used to measure fair value and a discussion of changes, if any, in the valuation technique(s) used to measure similar assets and/or liabilities in prior periods.

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