Investments (Tables)

12 Months Ended

Dec. 31, 2012

Investments

Summary of short-term and long-term investments

				Amortized		Gross unrealized		Gross unrealized		Fair
At December 31, 2012				cost		gains		losses		Value
Short-term investments:
	Available-for-sale investments:
		U.S. treasuries and government agency
			securities	$	387	$	---	$	---	$	387
		Corporate bonds			11		---		---		11
	Restricted cash										18
Total short-term investments										$	416
Long-term investments:
	Available-for-sale investments:
		Auction rate securities held through Morgan
			Stanley Smith Barney LLC	$	8	$	---	$	---	$	8
				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

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

Available-for-sale investments, contractually stated maturities

	Amortized		Fair
At December 31, 2012	cost		Value
U.S. government agency securities and corporate bonds
due in 1 year or less	$	398	$	398
Auction rate securities due after ten years		8		8
	$	406	$	406