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Shareholders' Equity (Stock Option Plans) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Beginning balance (in shares) 16,712,000 18,069,000 19,237,000
Granted (in shares) 2,468,000 2,057,000 2,310,000
Exercised (in shares) (3,232,000) (2,370,000) (1,809,000)
Expired or canceled (in shares) (135,000) (1,044,000) (1,669,000)
Ending balance (in shares) 15,813,000 16,712,000 18,069,000
Weighted Avg. Price      
Beginning balance (in USD per share) $ 37.63 $ 31.57 $ 28.71
Granted, weighted avg. price (in USD per share) 49.94 69.87 49.57
Exercised, weighted avg. price (in USD per share) 25.93 21.22 24.82
Expired or canceled, weighted avg. price (in USD per share) 49.58 33.42 30.86
Ending balance (in USD per share) $ 41.84 $ 37.63 $ 31.57
Total options that were exercisable (in shares) 9,359,000 10,624,000 6,692,000
Exercisable shares, weighted avg. price (in USD per share) $ 32.89    
Available for future grant as of December 31, 2018 (in shares) 21,775,000