Note 3 - 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	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
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	21		20
12 months or Greater, Fair Value	$ 37		$ 38
12 months or Greater, Unrealized Losses	(4)	[1]	(8)	[1]
Total, Fair Value	37		38
Total, Unrealized Losses	$ (4)		$ (8)

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