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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares Under Option      
Shares Under Option Outstanding at January 1, 16,009,754    
Granted Shares Under Option 523,946    
Exercised Shares Under Option (1,611,987)    
Expired Shares Under Option (2,488,045)    
Forfeited Shares Under Option (78,374)    
Shares Under Option Outstanding at December 31, 12,355,294 16,009,754  
Vested and expected to vest at December 31, 12,343,714    
Shares Under Option Exercisable at December 31, 11,116,386    
Weighted Average Exercise Price      
Weighted Average Exercise Price Outstanding at January 1, $ 38.77    
Granted Weighted Average Exercise Price 45.50 $ 46.85 $ 34.33
Exercised Weighted Average Exercise Price 33.68    
Expired Weighted Average Exercise Price 53.63    
Forfeited Weighted Average Exercise Price 41.90    
Weighted Average Exercise Price Outstanding at December 31, 36.70 $ 38.77  
Weighted Average Exercise Price Aggregate number of stock options expected to vest at December 31, 36.70    
Weighted Average Exercise Price Exercisable at December 31, $ 35.96    
Weighted Average Remaining Contractual Term      
Weighted Average Remaining Contractual Term Outstanding at January 1, 3 years 6 months 21 days 3 years 6 months 13 days  
Weighted Average Remaining Contractual Term Aggregate number of stock options expected to vest at December 31, 3 years 6 months 17 days    
Weighted Average Remaining Contractual Term Exercisable at December 31, 3 years 6 days    
Aggregate Intrinsic Value      
Aggregate Intrinsic Value Outstanding at January 1, $ 198    
Aggregate Intrinsic Value Outstanding at December 31, 66 $ 198  
Aggregate Intrinsic Value Aggregate number of stock options expected to vest at December 31, 66    
Aggregate Intrinsic Value Exercisable at December 31, $ 64    
Sale of Stock, Price Per Share $ 41.06 $ 50.56