Investments (Tables)

12 Months Ended

Dec. 31, 2011

Investments

Summary of short-term and long-term investments

				Amortized		Gross unrealized		Gross unrealized		Fair
At December 31, 2011				cost		gains		losses		Value
Short-term investments:
	Available-for-sale investments:
		U.S. treasuries and government agency
			securities	$	344	$	---	$	---	$	344
	Restricted cash										16
Total short-term investments										$	360
Long-term investments:
	Available-for-sale investments:
	Auction rate securities held through Morgan
		Stanley Smith Barney LLC		$	17	$	---	$	(1)	$	16
				Amortized		Gross unrealized		Gross unrealized		Fair
At December 31, 2010				cost		gains		losses		Value
Short-term investments:
	Available-for-sale investments:
		U.S. treasuries and government agency
			securities	$	672	$	---	$	---	$	672
	Restricted cash										24
Total short-term investments										$	696
Long-term investments:
	Available-for-sale investments:
	Auction rate securities held through Morgan
		Stanley Smith Barney LLC		$	27	$	---	$	(4)	$	23

Available-for-sale investments, continuous unrealized loss position

	Less than 12 months				12 months or more				Total
	Unrealized		Fair		Unrealized		Fair		Unrealized		Fair
At December 31, 2011	losses		Value		losses		Value		losses		Value
Taxable auction rate securities	$	---	$	---	$	(1)	$	16	$	(1)	$	16
	Less than 12 months				12 months or more				Total
	Unrealized		Fair		Unrealized		Fair		Unrealized		Fair
At December 31, 2010	losses		Value		losses		Value		losses		Value
Taxable auction rate securities	$	---	$	---	$	(4)	$	23	$	(4)	$	23

Available-for-sale investments, contractually stated maturities

	Amortized		Fair
At December 31, 2011	cost		Value
U.S. government agency securities due in 1 year or less	$	344	$	344
Due after ten years		17		16
	$	361	$	360