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Equity (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Share Repurchases
Total share repurchases were as follows for the three months ended March 31, 2017 and 2016:
 
Three Months Ended 
 March 31,
(In millions, except per share data)
2017
 
2016
Number of shares repurchased
9

 
2

Cash paid for shares repurchased
$
420

 
$
75

Effective average cost per delivered share
$
50.15

 
$
43.96