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Note 5 - Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
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%