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Note 6 - Available-for-Sale Investments (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]      
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value [1] $ 35    
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount 4   $ 4
Proceeds from Sale of Short-term Investments $ 825 $ 574  
[1] Includes $35 million of asset-based securities that mature over time and are being reported at their final maturity dates.