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Note 6 - Income Taxes (Details) - Net Deferred Tax Assets - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Net Deferred Tax Assets [Abstract]    
Current deferred tax assets   $ 248
Non-current deferred tax assets $ 2,056 1,889
Current deferred tax liabilities   (5)
Non-current deferred tax liabilities (340) (376)
Net deferred tax assets $ 1,716 $ 1,756