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Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Share Repurchases
Total share repurchases were as follows for the respective periods:
(In millions, except per share data)
2018
 
2017
 
2016
Number of shares repurchased
47

 
44

 
4

Cash paid for shares repurchased
$
3,287

 
$
2,372

 
$
197

Average cost per share
$
69.46

 
$
53.85

 
$
41.84