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Share-Based Compensation And Other Compensation Arrangements (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
Feb. 28, 2020
Feb. 24, 2020
Mar. 31, 2020
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units (RSUs) granted to executives   325,108  
Restricted stock units (RSUs) granted to executives (fair value per share)   $ 319.04  
Share-based payment award vesting period (in years)   3 years  
Performance Based Restricted Stock Units (PBRSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units (RSUs) granted to executives (fair value per share)   $ 357.38  
Share-based payment award vesting period (in years)   3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   27.04%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   1.21%  
Performance Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment award vesting period (in years) 3 years    
Performance award period end date Dec. 31, 2022    
Performance Awards | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout Amount, Aggregate     $ 0
2020 PBRSU | Performance Based Restricted Stock Units (PBRSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units (RSUs) granted to executives   290,202  
2020 Performance Awards | Performance Awards | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout Amount, Aggregate     $ 311