Note 7 - Available-for-Sale Investments (Details) - Summary of Maturities of Available-for-Sale Securities (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Summary of Maturities of Available-for-Sale Securities [Abstract]
Less than one year	$ 468
Due in 1-5 years	169
Due in 5-10 years	0
Due after 10 years (1)	40	[1]
Total	$ 677

[1] Includes $40 million of asset-based securities that mature over time and are being reported at their final maturity dates.