Note 6 - Available-for-Sale Investments (Details) - Summary of Maturities of Available-for-Sale Securities $ in Millions	Sep. 30, 2015 USD ($)
Summary of Maturities of Available-for-Sale Securities [Abstract]
Less than one year	$ 545
Due in 1-5 years	28
Due in 5-10 years
Due after 10 years (1)	35	[1]
Total	$ 608

[1] Includes $35 million of asset-based securities that mature over time and are being reported at their final maturity dates.