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Share Repurchase Program (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of Repurchase Activity
The table below summarizes annual share repurchase activity under these plans (in millions, except per share amounts):
 
 
 
 
 
 
Total cost of shares
 
 
 
 
 
 
purchased as part of
 
 
Total number of
 
Average price
 
publicly announced
Three months ended
 
shares purchased
 
paid per share
 
plans or programs
June 30, 2018
 
2.1

 
$
95.83

 
$
200

March 31, 2018
 
4.1

 
$
97.70

 
$
401

December 31, 2017
 
1.1

 
$
93.24

 
$
105