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Note 6 - Available-for-Sale Investments (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]    
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value [1] $ 35  
Proceeds from Sale of Short-term Investments $ 1,046 $ 954
[1] Includes $35 million of asset-based securities that mature over time and are being reported at their final maturity dates.