Condensed Consolidated Statement Of Shareholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Capital in excess of par value	Retained earnings	Accumulated other comprehensive loss	Total Walmart shareholders' equity	Noncontrolling interest
Beginning balance (in shares) at Jan. 31, 2020		2,832
Beginning balance at Jan. 31, 2020	$ 81,552	$ 284	$ 3,247	$ 83,943	$ (12,805)	$ 74,669	$ 6,883
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income	4,074			3,990		3,990	84
Other comprehensive income (loss), net of income taxes	(4,075)				(3,363)	(3,363)	(712)
Dividends declared	(6,117)			(6,117)		(6,117)
Purchase of Company stock (in shares)		(6)
Purchase of Company stock, Value	(693)	$ (1)	(26)	(666)		(693)
Dividends declared to noncontrolling interests	(359)						(359)
Other (in shares)		6
Other	(272)	$ 1	(238)	(9)		(246)	(26)
Ending balance (in shares) at Apr. 30, 2020		2,832
Ending balance at Apr. 30, 2020	74,110	$ 284	2,983	81,141	(16,168)	68,240	5,870
Beginning balance (in shares) at Jan. 31, 2021		2,821
Beginning balance at Jan. 31, 2021	87,531	$ 282	3,646	88,763	(11,766)	80,925	6,606
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income	2,811			2,730		2,730	81
Other comprehensive income (loss), net of income taxes	3,746				3,820	3,820	(74)
Dividends declared	(6,200)			(6,200)		(6,200)
Purchase of Company stock (in shares)		(21)
Purchase of Company stock, Value	(2,832)	$ (2)	(112)	(2,718)		(2,832)
Dividends declared to noncontrolling interests	(408)						(408)
Other (in shares)		5
Other	(56)		(110)	2		(108)	52
Ending balance (in shares) at Apr. 30, 2021		2,805
Ending balance at Apr. 30, 2021	$ 84,592	$ 280	$ 3,424	$ 82,577	$ (7,946)	$ 78,335	$ 6,257