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Share Repurchase Program - (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jul. 20, 2017
Equity, Class of Treasury Stock [Line Items]        
Stock repurchase program authorized amount       $ 4,000
Remaining amount available for stock repurchase   $ 3,500    
Purchases of treasury stock (in shares)   4.1 1.1  
Average price paid per share (in dollars per share)   $ 97.70 $ 93.24  
Subsequent Event        
Equity, Class of Treasury Stock [Line Items]        
Purchases of treasury stock (in shares) 2.1      
Payments to acquire shares $ 200      
Average price paid per share (in dollars per share) $ 95.83