Note 7 - Available-for-Sale Investments (Details) - Fair Value and Gross Unrealized Losses of Investments by Length of Time in Continuous Unrealized Loss Position (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
Fair Value and Gross Unrealized Losses of Investments by Length of Time in Continuous Unrealized Loss Position [Abstract]
Number of securities in a loss position	20		22
12 months or greater, fair value	$ 40		$ 40
12 months or greater, unrealized losses	(8)		(11)	[1]
Total, fair value	40		40
Total, unrealized losses	$ (8)	[1]	$ (11)

[1] Unrealized losses in securities less than 12 months were not significant.