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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock-Based Compensation [Abstract]      
Outstanding, beginning of year, Shares 1,917 1,694 2,087
Outstanding, beginning of year, Weighted-Average Exercise Price $ 490.06 $ 490.70 $ 395.46
Shares granted 304 460 379
Granted, Weighted-Average Exercise Price $ 426.70 $ 457.77 $ 659.12
Stock option and SOSAR exercises (shares) (35) (124) (716)
Exercised, Weighted-Average Exercise Price $ 307.83 $ 315.87 $ 297.25
Forfeited, Shares (187) (113) (56)
Forfeited, Weighted-Average Exercise Price $ 527.53 $ 559.25 $ 554.73
Outstanding, end of year, Shares 1,999 1,917 1,694
Outstanding, end of year, Weighted-Average Exercise Price $ 480.09 $ 490.06 $ 490.70
Outstanding, Weighted-Average Remaining Years of Contractual Life 3 years 8 months 12 days    
Outstanding, Aggregate Intrinsic Value $ 209    
Non-vested and expected to vest, shares 1,957    
Vested and expected to vest, Weighted-Average Exercise Price $ 480.77    
Vested and expected to vest, Weighted-Average Remaining Years of Contractual Life 3 years 8 months 12 days    
Vested and expected to vest, Aggregate Intrinsic Value $ 209    
Exercisable, Shares 1,130    
Exercisable, Weighted-Average Exercise Price $ 474.20    
Exercisable, Weighted-Average Remaining Years of Contractual Life 2 years 8 months 12 days    
Exercisable, Aggregate Intrinsic Value $ 209