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Note 3 - Fair Value Measurements (Details) - Money Market Funds (Fair Value, Inputs, Level 1 [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Fair Value, Inputs, Level 1 [Member]
     
Note 3 - Fair Value Measurements (Details) - Money Market Funds [Line Items]      
Money market funds (1) $ 48 [1] $ 66 [1] $ 69 [1]
[1] Carried at fair value and classified as Level 1 within the fair value hierarchy.