Consolidated Statements Of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Capital in excess of par value [Member]	Retained earnings [Member]	Retained earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated other comprehensive income (loss) [Member]	Total Walmart shareholders' equity [Member]	Total Walmart shareholders' equity [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Noncontrolling interest [Member]	Noncontrolling interest [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning balances (in shares) at Jan. 31, 2019			2,878
Beginning balances at Jan. 31, 2019	$ 79,634	$ (300)	$ 288	$ 2,965	$ 80,785	$ (266)	$ (11,542)	$ 72,496	$ (266)	$ 7,138	$ (34)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income	15,201				14,881			14,881		320
Other comprehensive income (loss), net of income taxes	(1,235)						(1,263)	(1,263)		28
Cash dividends declared	(6,048)				(6,048)			(6,048)
Purchase of Company stock (in shares)			(53)
Purchase of Company stock	(5,639)		$ (5)	(199)	(5,435)			(5,639)
Sale of subsidiary stock	(475)									(475)
Sale of subsidiary stock	52			37				37		15
Other (in shares)			7
Other	362		$ 1	444	26			471		(109)
Ending balances (in shares) at Jan. 31, 2020			2,832
Ending balances at Jan. 31, 2020	$ 81,552		$ 284	3,247	83,943		(12,805)	74,669		6,883
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in USD per share)	$ 2.12
Consolidated net income	$ 13,706				13,510			13,510		196
Other comprehensive income (loss), net of income taxes	826						1,039	1,039		(213)
Cash dividends declared	(6,116)				(6,116)			(6,116)
Purchase of Company stock (in shares)			(20)
Purchase of Company stock	(2,658)		$ (2)	(97)	(2,559)			(2,658)
Sale of subsidiary stock	(365)									(365)
Sale of subsidiary stock	140			29				29		111
Other (in shares)			9
Other	446			467	(15)			452		(6)
Ending balances (in shares) at Jan. 31, 2021			2,821
Ending balances at Jan. 31, 2021	$ 87,531		$ 282	3,646	88,763		(11,766)	80,925		6,606
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in USD per share)	$ 2.16
Consolidated net income	$ 13,940				13,673			13,673		267
Other comprehensive income (loss), net of income taxes	2,770						3,000	3,000		(230)
Cash dividends declared	(6,152)				(6,152)			(6,152)
Purchase of Company stock (in shares)			(70)
Purchase of Company stock	(9,808)		$ (7)	(426)	(9,375)			(9,808)
Sale of subsidiary stock	(416)									(416)
Sale of subsidiary stock	3,239			952				952		2,287
Other (in shares)			10
Other	787		$ 1	667	(5)			663		124
Ending balances (in shares) at Jan. 31, 2022			2,761
Ending balances at Jan. 31, 2022	$ 91,891		$ 276	$ 4,839	$ 86,904		$ (8,766)	$ 83,253		$ 8,638
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in USD per share)	$ 2.20