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Stock-Based Compensation (Summary Of Stock Options Outstanding Information) (Details) - Employee Stock Option [Member]
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, minimum (in usd per share) $ 51
Exercise Price, maximum (in usd per share) $ 108.20
Number of Outstanding Options | shares 5,164,854
Weighted-Avg. Remaining Contractual Life-Yrs 4 years 2 months 5 days
Weighted-Avg. Exercise Price (in usd per share) $ 83.26
Number of Exercisable Options | shares 4,027,902
Weighted-Avg. Exercise Price (in usd per share) $ 86.37
Range Of Exercise Prices 2 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, minimum (in usd per share) 65
Exercise Price, maximum (in usd per share) $ 78.99
Number of Outstanding Options | shares 2,790,045
Weighted-Avg. Remaining Contractual Life-Yrs 5 years 6 months 22 days
Weighted-Avg. Exercise Price (in usd per share) $ 72.94
Number of Exercisable Options | shares 1,751,402
Weighted-Avg. Exercise Price (in usd per share) $ 74.36
Range Of Exercise Prices 3 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, minimum (in usd per share) 79
Exercise Price, maximum (in usd per share) $ 91.99
Number of Outstanding Options | shares 441,000
Weighted-Avg. Remaining Contractual Life-Yrs 6 years 12 months 30 days
Weighted-Avg. Exercise Price (in usd per share) $ 89.90
Number of Exercisable Options | shares 342,691
Weighted-Avg. Exercise Price (in usd per share) $ 89.90
Range Of Exercise Prices 4 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, minimum (in usd per share) 92
Exercise Price, maximum (in usd per share) $ 108.20
Number of Outstanding Options | shares 1,431,100
Weighted-Avg. Remaining Contractual Life-Yrs 22 days
Weighted-Avg. Exercise Price (in usd per share) $ 108.20
Number of Exercisable Options | shares 1,431,100
Weighted-Avg. Exercise Price (in usd per share) $ 108.20
Range Of Exercise Prices1 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, minimum (in usd per share) 51
Exercise Price, maximum (in usd per share) $ 64.99
Number of Outstanding Options | shares 502,709
Weighted-Avg. Remaining Contractual Life-Yrs 5 years 8 months 24 days
Weighted-Avg. Exercise Price (in usd per share) $ 63.68
Number of Exercisable Options | shares 502,709
Weighted-Avg. Exercise Price (in usd per share) $ 63.68