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Earnings Per Share (Tables)
 12 Months Ended
Jan. 31, 2020
Earnings Per Share [Abstract]  
Schedule of earnings per share, basic and diluted The following table reconciles earnings per common share for 2019, 2018, and 2017:
(In millions, except per share data)
2019
 
2018
 
2017
Basic earnings per common share:
 
 
 
 
 
Net earnings attributable to Lowe's Companies, Inc.
$
4,281

 
$
2,314

 
$
3,447

Less: Net earnings allocable to participating securities
(13
)
 
(7
)
 
(11
)
Net earnings allocable to common shares, basic
$
4,268

 
$
2,307

 
$
3,436

Weighted-average common shares outstanding
777

 
811

 
839

Basic earnings per common share
$
5.49

 
$
2.84

 
$
4.09

Diluted earnings per common share:
 
 
 
 
 
Net earnings attributable to Lowe's Companies, Inc.
$
4,281

 
$
2,314

 
$
3,447

Less: Net earnings allocable to participating securities
(13
)
 
(7
)
 
(11
)
Net earnings allocable to common shares, diluted
$
4,268

 
$
2,307

 
$
3,436

Weighted-average common shares outstanding
777

 
811

 
839

Dilutive effect of non-participating share-based awards
1

 
1

 
1

Weighted-average common shares, as adjusted
778

 
812

 
840

Diluted earnings per common share
$
5.49

 
$
2.84

 
$
4.09