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Per Share Data (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Diluted EPS Calculation Continuing Operations
Basic and Diluted EPS Calculation
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions, except per share amounts)
2017

 
2016

 
2017

 
2016

Basic weighted average common shares outstanding
514

 
521

 
514

 
521

Dilutive effect of potentially issuable common shares
6

 
4

 
7

 
5

Diluted weighted average common shares outstanding
520

 
525

 
521

 
526

Average stock price used to calculate common stock equivalents
$
75.41

 
$
64.17

 
$
73.36

 
$
60.01