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Earnings Per Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
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



The diluted net earnings per share calculation included the dilutive effect of convertible debt that is offset by the related reduction in interest expense of $1 million after-tax for year 2017, $2 million for year 2016 and $3 million for year 2015.
The diluted net earnings per share calculation for 2017, 2016 and 2015 included all shares related to stock options, as the exercise price of all options was less than the average market value of the Company's stock.