Earnings Per Share - EPS Schedule (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2020	Feb. 01, 2019	Feb. 02, 2018
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 (in shares)	777.0	811.0	839.0
Basic earnings per common share (in dollars per 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 (in shares)	777.0	811.0	839.0
Dilutive effect of non-participating share-based awards (in shares)	1.0	1.0	1.0
Weighted-average common shares, as adjusted (in shares)	778.0	812.0	840.0
Diluted earnings per common share (in dollars per share)	$ 5.49	$ 2.84	$ 4.09
Anti-dilutive securities	0.9	0.5	0.5