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Shareholders' Equity And Net Income Per Share Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share Repurchase Program [Line Items]      
Stock Repurchased During Period, Shares 6,530,369 4,667,193 9,481,946
Stock Repurchased, Average Price $ 76.44 $ 82.00 $ 66.93
Stock Repurchased During Period, Value $ 499 $ 383 $ 635
Share Repurchase Program April 2016      
Share Repurchase Program [Line Items]      
Stock Repurchase Program, Authorized Amount 1,500    
Stock Repurchase Program, Remaining Authorized Repurchase Amount 490    
Share Repurchase Program January 2015      
Share Repurchase Program [Line Items]      
Stock Repurchase Program, Authorized Amount 1,500    
Share Repurchase Program January 2019 [Member]      
Share Repurchase Program [Line Items]      
Stock Repurchase Program, Authorized Amount $ 2,000