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, 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	10,513
Other comprehensive income (loss), net of income taxes	(3,639)
Ending balance (in shares) at Jul. 31, 2020		2,834
Ending balance at Jul. 31, 2020	81,197	$ 283	3,197	87,614	(15,784)	75,310	5,887
Beginning balance (in shares) at Apr. 30, 2020		2,832
Beginning balance at Apr. 30, 2020	74,110	$ 284	2,983	81,141	(16,168)	68,240	5,870
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income	6,439			6,476		6,476	(37)
Other comprehensive income (loss), net of income taxes	436				384	384	52
Dividends declared to noncontrolling interests	(3)						(3)
Other (in shares)		2
Other	215	$ (1)	214	(3)		210	5
Ending balance (in shares) at Jul. 31, 2020		2,834
Ending balance at Jul. 31, 2020	81,197	$ 283	3,197	87,614	(15,784)	75,310	5,887
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
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	7,175
Other comprehensive income (loss), net of income taxes	3,794
Ending balance (in shares) at Jul. 31, 2021		2,791
Ending balance at Jul. 31, 2021	87,127	$ 278	3,655	84,572	(7,976)	80,529	6,598
Beginning balance (in shares) at Apr. 30, 2021		2,805
Beginning balance at Apr. 30, 2021	84,592	$ 280	3,424	82,577	(7,946)	78,335	6,257
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income	4,364			4,276		4,276	88
Other comprehensive income (loss), net of income taxes	48				(30)	(30)	78
Purchase of Company stock (in shares)		(17)
Purchase of Company stock, Value	(2,369)	$ (2)	(94)	(2,273)		(2,369)
Dividends declared to noncontrolling interests	(10)						(10)
Other (in shares)		3
Other	502		325	(8)		317	185
Ending balance (in shares) at Jul. 31, 2021		2,791
Ending balance at Jul. 31, 2021	$ 87,127	$ 278	$ 3,655	$ 84,572	$ (7,976)	$ 80,529	$ 6,598