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Net Income Per Common Share (Tables)
 12 Months Ended
Jan. 31, 2018
Earnings Per Share [Abstract]  
Schedule of calculation of numerator and denominator in earnings per share
The following table provides a reconciliation of the numerators and denominators used to determine basic and diluted net income per common share attributable to Walmart:
 
 
Fiscal Years Ended January 31,
(Amounts in millions, except per share data)
 
2018
 
2017
 
2016
Numerator
 
 
 
 
 
 
Consolidated net income
 
$
10,523

 
$
14,293

 
$
15,080

Consolidated net income attributable to noncontrolling interest
 
(661
)
 
(650
)
 
(386
)
Consolidated net income attributable to Walmart
 
$
9,862

 
$
13,643

 
$
14,694

 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
Weighted-average common shares outstanding, basic
 
2,995

 
3,101

 
3,207

Dilutive impact of stock options and other share-based awards
 
15

 
11

 
10

Weighted-average common shares outstanding, diluted
 
3,010

 
3,112

 
3,217


 
 
 
 
 
 
Net income per common share attributable to Walmart
 
 
 
 
 
 
Basic
 
$
3.29

 
$
4.40

 
$
4.58

Diluted
 
3.28

 
4.38

 
4.57