Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis



Millions of dollars	Total				Quoted Prices In Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Valuation Technique
	2011		2010		2011		2010		2011		2010		2011		2010
Money market funds⁽¹⁾	$	—	$	414	$	—	$	414	$	—	$	—	$	—	$	—	(a)
Net derivative contracts	80		125		—		—		80		125		—		—		(a)
Available for sale investments	27		25		27		25		—		—		—		—		(a)

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(1)	Money market funds are primarily comprised of United States government obligations.

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by 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 (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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