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Note 8 - Investments (Details) - Dow Corning Corporation [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Note 8 - Investments (Details) [Line Items]          
Research and Development Expense $ 54   $ 70 $ 179 $ 207
Equity Method Investment, Summarized Financial Information, Derivative, Loss on Derivative $ 56   24 $ 98  
Gain (Loss) on Contract Termination   $ 178      
Equity Method Investment, Summarized Financial Information, Derivative, Gain on Derivative         $ 90
Foreign Tax Credit [Member]          
Note 8 - Investments (Details) [Line Items]          
Equity Method Investment, Summarized Financial Information, Tax Credit     $ 82