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Equity Based Compensation (Disclosure of Share-based Compensation Arrangements by Share-based Payment Award) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options, Grants in Period, Weighted Average Exercise Price $ 117.85 $ 145.25 $ 150.87
Options, Outstanding, Intrinsic Value $ 43.5    
Options, Exercisable, Intrinsic Value $ 43.5    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, Number, Beginning Balance 325,851    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 175,047    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (138,785) (248,789)  
Forfeited (3,137)    
Outstanding, Number, Ending Balance 291,129 [1] 325,851  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options, Grants in Period, Weighted Average Exercise Price $ 117.85    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period (67,847)    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, Number, Beginning Balance 62,194    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 37,135    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (20,232)    
Forfeited (2,707)    
Outstanding, Number, Ending Balance 76,390 [1] 62,194  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period 0    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, Number, Beginning Balance 2,031,797    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 455,455    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (312,345)    
Forfeited (6,512)    
Outstanding, Number, Ending Balance 2,168,395 2,031,797  
Options exercisable 1,695,704    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options, Outstanding, Weighted Average Exercise Price, Beginning of Period $ 92.63    
Options, Grants in Period, Weighted Average Exercise Price 117.96    
Exercised / Lapsed 61.70    
Forfeited 126.50    
Options, Outstanding, Weighted Average Exercise Price, End of Period 102.30 $ 92.63  
Options exercisable $ 95.68    
[1] Amount outstanding at December 31, 2020, includes the amount of shares to be issued under RSUs expected to vest and number of shares to be issued under PCUs at target performance. The PCU amount of shares do not reflect potential increases or decreases that may result from the performance factor, except for the 2018 – 2020 PCU grants, which vested as of December 31, 2020.