Summary of Significant Accounting Policies - Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024
Goodwill [Roll Forward]
Beginning balance	$ 28,113	$ 28,174
Changes in currency translation and other	(696)	(68)
Acquisitions	1,375	7
Ending balance	28,792	28,113
Walmart U.S.
Goodwill [Roll Forward]
Beginning balance	3,364	3,374
Changes in currency translation and other	0	(10)
Acquisitions	1,375	0
Ending balance	4,739	3,364
Walmart International
Goodwill [Roll Forward]
Beginning balance	24,428	24,479
Changes in currency translation and other	(696)	(58)
Acquisitions	0	7
Ending balance	23,732	24,428
Sam's Club U.S.
Goodwill [Roll Forward]
Beginning balance	321	321
Changes in currency translation and other	0	0
Acquisitions	0	0
Ending balance	$ 321	$ 321