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Note 5 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Benefit (provision) for income taxes (Note 5) | $ 504 | $ (110) | $ 808 | $ (196)
Effective tax rate | (29.60%) | 18.20% | (78.40%) | 17.80%

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