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Equity Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity compensation expense   $ 40 $ 3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 200,239    
Stock appreciation rights granted, weighted average exercise price (per share)   $ 129.01  
Shares Granted To Non Employee Directors   8,154  
Document Period End Date   Sep. 30, 2021  
Options exercisable (shares)   1,609,025  
Options exercisable, weighted average price (per share)   $ 97.48  
Options, remaining term   4 years 2 months 12 days  
Compensation cost not yet recognized   $ 39  
Period for recognition   9 months 18 days  
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   167,883  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   327,813