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Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Share Repurchases
Total share repurchases were as follows for the respective periods:
(In millions, except per share data)
2019
 
2018
 
2017
Number of shares repurchased
34

 
47

 
44

Cash paid for shares repurchased
$
1,950

 
$
3,287

 
$
2,372

Average cost per share
$
58.87

 
$
69.46

 
$
53.85