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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Reconciliation of Basic Net Earnings per Share to Diluted Net Earnings per Share
The following is a reconciliation of basic net earnings per share to diluted net earnings per share for the fiscal years ended December 31, 2017, January 1, 2017 and January 3, 2016:
(In Millions Except Per Share Amounts)
 
2017
 
2016
 
2015
Basic net earnings per share
 
$
0.48

 
6.04

 
5.56

Average shares outstanding — basic
 
2,692.0

 
2,737.3

 
2,771.8

Potential shares exercisable under stock option plans
 
139.7

 
142.4

 
141.5

Less: shares repurchased under treasury stock method
 
(87.3
)
 
(92.1
)
 
(102.6
)
Convertible debt shares
 
0.9

 
1.3

 
2.2

Adjusted average shares outstanding — diluted
 
2,745.3

 
2,788.9

 
2,812.9

Diluted net earnings per share
 
$
0.47

 
5.93

 
5.48