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Stock-Based Compensation Plans (Summary Of Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, as of December 31 522,827    
Granted 4,235    
Converted (1,439)    
Forfeited 8,850    
Outstanding, as of December 31 516,773 [1] 522,827  
Vested 308,509    
Weighted Average Grant-Date Fair Value Per Share, Outstanding as of December 31 $ 126.59    
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Granted 363.11 $ 206.45 $ 181.04
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Converted 159.08    
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Forfeited 206.45    
Weighted Average Grant-Date Fair Value Per Share, Outstanding as of December 31 127.07 $ 126.59  
Weighted Average Grant-Date Fair Value Per Share, Vested as of December 31 $ 114.92    
Aggregate Intrinsic Value, Outstanding [2] $ 197.3    
Aggregate Intrinsic Value, Vested [2] $ 117.8    
Weighted Average Remaining Contractual Term, Outstanding 4 years 4 months    
Weighted Average Remaining Contractual Term, Vested 3 years 5 months    
[1] No RSUs outstanding at December 31, 2018 were convertible to shares of common stock.
[2] The intrinsic value of RSUs is measured by applying the closing stock price as of December 31, 2018 to the applicable number of units.