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Shareholders' equity (Rollforward Of Changes In Common Stock Shares Issued And Outstanding) (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
Shares issued, Beginning of year 479,783,864 479,783,864 342,832,412
Stock Issued During Period, Shares, New Issues 0 0 136,951,452
Shares issued, End of year 479,783,864 479,783,864 479,783,864
Common Shares in treasury, end of year (20,580,486) (15,950,685) (13,815,148)
Shares issued and outstanding, end of year 459,203,378 463,833,179 465,968,716