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Equity Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 9 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity compensation expense   $ 3 $ 29
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 456,301    
Stock appreciation rights granted, weighted average exercise price (per share)   $ 117.85  
Shares Granted To Non Employee Directors   16,665  
Document Period End Date   Sep. 30, 2020  
Options exercisable (shares)   1,263,304  
Options exercisable, weighted average price (per share)   $ 87.78  
Options, remaining term   4 years 1 month 6 days  
Compensation cost not yet recognized   $ 21  
Period for recognition   1 year  
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   175,047  
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   30,129