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Equity (Summary of Activity Related to Stock Options) (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares Under Option      
Shares Under Option Outstanding at January 1, 12,355,294    
Granted Shares Under Option 657,226    
Exercised Shares Under Option (3,846,478)    
Expired Shares Under Option (113,847)    
Forfeited Shares Under Option (40,872)    
Shares Under Option Outstanding at December 31, 9,011,323 12,355,294  
Vested and expected to vest at December 31, 8,996,220    
Shares Under Option Exercisable at December 31, 7,833,189    
Weighted Average Exercise Price      
Weighted Average Exercise Price Outstanding at January 1, $ 36.70    
Granted Weighted Average Exercise Price 44.65 $ 45.50 $ 46.85
Exercised Weighted Average Exercise Price 32.38    
Expired Weighted Average Exercise Price 28.35    
Forfeited Weighted Average Exercise Price 44.97    
Weighted Average Exercise Price Outstanding at December 31, 39.20 $ 36.70  
Weighted Average Exercise Price Aggregate number of stock options expected to vest at December 31, 39.20    
Weighted Average Exercise Price Exercisable at December 31, $ 38.28    
Weighted Average Remaining Contractual Term      
Weighted Average Remaining Contractual Term Outstanding at January 1, 3 years 8 months 23 days 3 years 6 months 21 days  
Weighted Average Remaining Contractual Term Aggregate number of stock options expected to vest at December 31, 3 years 8 months 23 days    
Weighted Average Remaining Contractual Term Exercisable at December 31, 3 years 7 days    
Aggregate Intrinsic Value      
Aggregate Intrinsic Value Outstanding at January 1, $ 66    
Aggregate Intrinsic Value Outstanding at December 31, 106 $ 66  
Aggregate Intrinsic Value Aggregate number of stock options expected to vest at December 31, 106    
Aggregate Intrinsic Value Exercisable at December 31, $ 99    
Sale of Stock, Price Per Share $ 50.97 $ 41.06