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Stock-Based Compensation (Summary Of Option And SOSAR Activity Under Incentive Plan) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Stock-Based Compensation [Abstract]    
Outstanding, beginning of year, Shares 2,151  
Outstanding, beginning of year, Weighted-Average Exercise Price $ 474.51  
Shares granted 201  
Granted, Weighted-Average Exercise Price $ 601.59  
Stock option and SOSAR exercises (shares) (1,130)  
Exercised, Weighted-Average Exercise Price $ 510.35  
Forfeited, Shares (40)  
Forfeited, Weighted-Average Exercise Price $ 483.11  
Expired, Shares (50)  
Expired, Weighted-Average Exercise Price $ 559.29  
Outstanding, end of year, Shares 1,132  
Outstanding, end of year, Weighted-Average Exercise Price $ 457.14  
Outstanding, Weighted-Average Remaining Years of Contractual Life 4 years 4 months 24 days  
Outstanding, Aggregate Intrinsic Value $ 430,270 $ 49,160
Exercisable, Shares 365  
Exercisable, Weighted-Average Exercise Price $ 505.35  
Exercisable, Weighted-Average Remaining Years of Contractual Life 2 years 4 months 24 days  
Exercisable, Aggregate Intrinsic Value $ 121,242  
Vested and expected to vest, shares 1,095  
Vested and expected to vest, Weighted-Average Exercise Price $ 454.76  
Vested and expected to vest, Weighted-Average Remaining Years of Contractual Life 4 years 3 months 18 days  
Vested and expected to vest, Aggregate Intrinsic Value $ 418,815