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Employee Benefits And Stock-Based Compensation (Summary Of Unvested RSUs Activity) (Details) - $ / shares
shares in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested at beginning of period, Shares 0.6    
Granted, Shares 0.4    
Vested and settled, Shares (0.3)    
Unvested at end of period, Shares 0.7 0.6  
Unvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 206.32    
Granted, Weighted-Average Grant-Date Fair Value 212.80 $ 210.94 $ 200.64
Vested and settled, Weighted-Average Grant-Date Fair Value 205.66    
Unvested at end of period, Weighted-Average Grant-Date Fair Value $ 209.80 $ 206.32