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Shareholders' Equity (Summary Of Stock Option Activity And Related Information) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Shareholders' Equity [Abstract]      
Options, Outstanding at beginning of year 14,192,000 16,601,000 [1] 21,582,000
Weighted average exercise price, Outstanding at beginning of year $ 23.85 $ 23.12 $ 20.97
Options, Granted 2,125,000 2,139,000 1,845,000
Weighted average exercise price, Granted $ 52.92 $ 30.69 $ 25.86
Options, Exercised (2,324,000) (4,062,000) (6,039,000)
Weighted average exercise price, Exercised $ 22.83 $ 24.15 $ 16.40
Options, Expired (602,000) (470,000) (591,000)
Weighted average exercise price, Expired $ 26.97 $ 26.57 $ 23.31
Options, Forfeited (54,000) (16,000) (196,000)
Weighted average exercise price, Forfeited $ 27.89 $ 21.95 $ 19.60
Options, Outstanding at December 31 13,337,000 14,192,000 16,601,000 [1]
Weighted average exercise price, Outstanding at December 31 $ 28.50 $ 23.85 $ 23.12
Options, Exercisable at December 31 8,429,000 8,695,000 10,469,000
Weighted average exercise price, Exercisable at December 31 $ 24.21 $ 22.09 $ 22.86
Options outstanding and expected to vest 13,200,000    
[1] As of December 31, 2011, approximately 13.2 million options were outstanding and expected to vest. Options expected to vest reflect an estimated forfeiture rate for purposes of determining related compensation expense.