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Consolidated Statement of Financial Position (Parentheticals) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Property, plant and equipment, accumulated depreciation $ 326 $ 314
Common stock, par value $ 0.01 $ 0.01
Convertible Series A Preferred Stock [Member]    
Preferred stock, no par value 0 0
Preferred stock, liquidation preference per share $ 100 $ 100