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Earnings per Share (Narratives) (Details)
12 Months Ended
Dec. 31, 2017
Notes to Consolidated Financial Statements [Abstract]  
Description of instruments with potential future dilutive effect not included in calculation of diluted earnings per share At December 31, 2017, 20 million options (at December 31, 2016 and 2015 – 14 million options and 24 million options, respectively), were excluded from the diluted weighted average number of ordinary shares calculation as their effect would have been anti-dilutive