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Shareholders' Equity And Net Income Per Share Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share Repurchase Program [Line Items]          
Stock Repurchased During Period, in shares   793,424 1,018,930 2,513,136 4,667,193
Stock Repurchased, Average Price per Share   $ 86.08 $ 92.99 $ 88.24 $ 82.00
Stock Repurchased During Period, Value   $ 69 $ 95 $ 222 $ 383
Share Repurchase Program April 2016          
Share Repurchase Program [Line Items]          
Stock Repurchase Program, Authorized Amount   1,500   1,500  
Stock Repurchase Program, Remaining Authorized Repurchase Amount   767   767  
Share Repurchase Program January 2015          
Share Repurchase Program [Line Items]          
Stock Repurchase Program, Authorized Amount   $ 1,500   $ 1,500  
Subsequent Event          
Share Repurchase Program [Line Items]          
Stock Repurchased During Period, Value $ 42        
Subsequent Event | Share Repurchase Program April 2016          
Share Repurchase Program [Line Items]          
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 725