Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2011

Fair Value Measurements Disclosure [Abstract]

Fair value, assets and liabilities measured on a recurring basis

				Fair Value Measurements at
				September 30, 2011 Using
				Quoted
				Prices in
				Active
				Markets for		Significant
				Identical		Other		Significant
		As of		Financial		Observable		Unobservable
		September 30,		Instruments		Inputs		Inputs		Balance Sheet
		2011		(Level 1)		(Level 2)		(Level 3)		Classification
Financial assets:
Money market funds		$	2,329	$	2,329	$	---	$	---	Cash and cash equivalents
U.S. treasuries with original maturies of
	three months or less		11		11		---		---	Cash and cash equivalents
U.S. treasuries and government
	agency securities		391		391		---		---	Short-term investments
ARS held through Morgan Stanley
	Smith Barney LLC		25		---		---		25	Long-term investments
Total financial assets at fair value		$	2,756	$	2,731	$	---	$	25

				Fair Value Measurements at
				December 31, 2010 Using
				Quoted
				Prices in
				Active
				Markets for		Significant
				Identical		Other		Significant
		As of		Financial		Observable		Unobservable
		December 31,		Instruments		Inputs		Inputs		Balance Sheet
		2010		(Level 1)		(Level 2)		(Level 3)		Classification
Financial assets:
Money market funds		$	2,216	$	2,216	$	---	$	---	Cash and cash equivalents
U.S. treasuries and foreign government
	bonds with original maturities of
	three months or less		332		332		---		---	Cash and cash equivalents
U.S. treasuries and government agency
	securities		672		672		---		---	Short-term investments
ARS held through Morgan Stanley
	Smith Barney LLC		23		---		---		23	Long-term investments
Foreign exchange contract derivatives			1		---		1		---	Other assets—current
Total financial assets at fair value		$	3,244	$	3,220	$	1	$	23

Fair value, assets and liabilities measured on a recurring basis, Level 3 reconciliation

			Level 3
					Total
					financial
					assets at
			ARS		fair
			(a)		value
Balance at January 1, 2011			$	23	$	23
	Total unrealized gains included in
		other comprehensive income		2		2
Balance at September 30, 2011			$	25	$	25

			Level 3
							Total
							financial
					ARS rights		assets at
			ARS		from UBS		fair		Other financial
			(a)		(b)		value		liabilities
Balance at January 1, 2010			$	77	$	7	$	84	$	(23)
	Total gains (losses) (realized/unrealized)
		included in investment and other income, net		7		(7)		---		13
	Purchases of acquired sales, issuances and
		settlements		(61)		---		(61)		---
Balance at September 30, 2010			$	23	$	---	$	23	$	(10)
The amount of total gains(losses) for the
	period included in earnings attributable to
	the change in unrealized gains or losses
	relating to assets still held at September 30, 2010		$	---	$	---	$	---	$	13

Fair value, assets and liabilities measured on a nonrecurring basis

				Fair Value Measurements at
				December 31, 2010 Using
				Quoted
				Prices in
				Active
				Markets for		Significant
				Identical		Other		Significant
		As of		Financial		Observable		Unobservable
		December 31,		Instruments		Inputs		Inputs
		2010		(Level 1)		(Level 2)		(Level 3)		Total Losses
Non-financial assets:
Intangible assets, net		$	---	$	---	$	---	$	---	$	326
Total non-financial assets at fair
	value	$	---	$	---	$	---	$	---	$	326