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Stock-Based Compensation (Summary Of Stock Options Outstanding Information) (Details) - Employee Stock Option [Member]
12 Months Ended
Dec. 31, 2016
$ / 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 7,137,210
Weighted-Avg. Remaining Contractual Life-Yrs 3 years 4 months 7 days
Weighted-Avg. Exercise Price (in usd per share) $ 84.91
Number of Exercisable Options | shares 6,011,816
Weighted-Avg. Exercise Price (in usd per share) $ 86.96
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 2,853,753
Weighted-Avg. Remaining Contractual Life-Yrs 4 years 7 months 28 days
Weighted-Avg. Exercise Price (in usd per share) $ 74.47
Number of Exercisable Options | shares 2,161,853
Weighted-Avg. Exercise Price (in usd per share) $ 75.72
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 2,050,549
Weighted-Avg. Remaining Contractual Life-Yrs 1 year 10 months 3 days
Weighted-Avg. Exercise Price (in usd per share) $ 91.40
Number of Exercisable Options | shares 1,787,470
Weighted-Avg. Exercise Price (in usd per share) $ 91.62
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 1,434,600
Weighted-Avg. Remaining Contractual Life-Yrs 1 year 22 days
Weighted-Avg. Exercise Price (in usd per share) $ 108.20
Number of Exercisable Options | shares 1,434,600
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 798,308
Weighted-Avg. Remaining Contractual Life-Yrs 6 years 8 months 5 days
Weighted-Avg. Exercise Price (in usd per share) $ 63.75
Number of Exercisable Options | shares 627,893
Weighted-Avg. Exercise Price (in usd per share) $ 63.90