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Stock-Based Compensation (Summary Of Option Activity) (Details) - Omnibus Incentive Plan [Member] - Stock options [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Stock Options    
Total outstanding at the beginning of the period (in shares) 373,387  
Granted to employees (in shares) 338,923 0
Exercised (in shares) (8,000)  
Forfeited (in shares) (12,108)  
Expired (in shares) (6,725)  
Total outstanding at the end of the period (in shares) 685,477 373,387
Total exercisable at the end of the period (in shares) 176,180  
Weighted Average Exercise Price    
Total outstanding at the beginning of the period (in dollars per share) $ 30.06  
Granted to employees (in dollars per share) 34.48  
Exercised (in dollars per share) 8.41  
Forfeited (in dollars per share) 34.48  
Expired (in dollars per share) 24.39  
Total outstanding at the end of the period (in dollars per share) 32.48 $ 30.06
Total exercisable at the end of the period (in dollars per share) $ 26.20  
Total Outstanding, End of Period $ 10 $ 1
Total exercisable, End of Period $ 4  
Weighted Average Remaining Contractual Term    
Total outstanding at the end of the period 8 years 1 month 24 days 8 years 14 days
Total exercisable at the end of the period 6 years 3 months 25 days