Segments and Disaggregated Revenue - Schedule of Segment Reporting Information by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 642,637	$ 605,881	$ 567,762
Operating income (loss)	27,012	20,428	25,942
Interest, net	(2,137)	(1,874)	(1,836)
Loss on extinguishment of debt	0	0	(2,410)
Other gains and (losses)	(3,027)	(1,538)	(3,000)
Income before income taxes	21,848	17,016	18,696
Total assets	252,399	243,197	244,860
Depreciation and amortization	11,853	10,945	10,658
Capital expenditures	20,606	16,857	13,106
Walmart U.S.
Segment Reporting Information [Line Items]
Net sales	441,817	420,553	393,247
Operating income (loss)	22,154	20,620	21,587
Total assets	137,782	130,659	125,044
Depreciation and amortization	7,671	7,054	6,773
Capital expenditures	13,877	11,425	8,475
Walmart International
Segment Reporting Information [Line Items]
Net sales	114,641	100,983	100,959
Operating income (loss)	4,909	2,965	3,758
Total assets	86,136	86,766	91,403
Depreciation and amortization	2,159	1,964	1,963
Capital expenditures	2,911	2,625	2,497
Sam's Club
Segment Reporting Information [Line Items]
Net sales	86,179	84,345	73,556
Operating income (loss)	2,192	1,964	2,259
Total assets	15,682	15,490	14,678
Depreciation and amortization	642	609	601
Capital expenditures	1,041	727	622
Corporate and support
Segment Reporting Information [Line Items]
Net sales	0	0	0
Operating income (loss)	(2,243)	(5,121)	(1,662)
Total assets	12,799	10,282	13,735
Depreciation and amortization	1,381	1,318	1,321
Capital expenditures	$ 2,777	$ 2,080	$ 1,512