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Shareholders' equity (Rollforward Of Changes In Common Stock Shares Issued And Outstanding) (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Changes In Common Stock Shares Issues And Outstanding [Roll Forward]      
Shares issued, beginning of year 342,832,412 341,094,559 337,841,616
Shares issued, net 0 0 2,268,000
Exercise of stock options 0 1,737,853 984,943
Shares issued, end of year 342,832,412 342,832,412 341,094,559
Common Shares in treasury, end of year (2,510,878) (5,905,136) (6,151,707)
Shares issued and outstanding, end of year 340,321,534 336,927,276 334,942,852
Balance, beginning of year (9,467) (101,481) (101,481)
Shares redeemed 0 92,014 0
Balance, end of year (9,467) (9,467) (101,481)