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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares Under Option      
Shares Under Option Outstanding at January 1, 9,011,323    
Granted Shares Under Option 487,564    
Exercised Shares Under Option (2,363,639)    
Expired Shares Under Option (55,844)    
Forfeited Shares Under Option (36,963)    
Shares Under Option Outstanding at December 31, 7,042,441 9,011,323  
Vested and expected to vest at December 31, 7,030,683    
Shares Under Option Exercisable at December 31, 6,005,334    
Weighted Average Exercise Price      
Weighted Average Exercise Price Outstanding at January 1, $ 39.20    
Granted Weighted Average Exercise Price 47.58 $ 44.65 $ 45.50
Exercised Weighted Average Exercise Price 37.79    
Expired Weighted Average Exercise Price 34.27    
Forfeited Weighted Average Exercise Price 46.56    
Weighted Average Exercise Price Outstanding at December 31, 40.25 $ 39.20  
Weighted Average Exercise Price Aggregate number of stock options expected to vest at December 31, 40.25    
Weighted Average Exercise Price Exercisable at December 31, $ 39.24    
Weighted Average Remaining Contractual Term      
Weighted Average Remaining Contractual Term Outstanding at January 1, 3 years 11 months 12 days 3 years 8 months 23 days  
Weighted Average Remaining Contractual Term Aggregate number of stock options expected to vest at December 31, 3 years 11 months 8 days    
Weighted Average Remaining Contractual Term Exercisable at December 31, 3 years 2 months 1 day    
Aggregate Intrinsic Value      
Aggregate Intrinsic Value Outstanding at January 1, $ 106    
Aggregate Intrinsic Value Outstanding at December 31, 47 $ 106  
Aggregate Intrinsic Value Aggregate number of stock options expected to vest at December 31, 47    
Aggregate Intrinsic Value Exercisable at December 31, $ 46    
Sale of Stock, Price Per Share $ 46.95 $ 50.97