Segments and Disaggregated Revenue - Schedule of Segment Reporting Information by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Segment Reporting Information [Line Items]
Net sales	$ 674,538	$ 642,637	$ 605,881
Membership and other income	6,447	5,488	5,408
Total revenues	680,985	648,125	611,289
Cost of sales	511,753	490,142	463,721
Operating, selling, general and administrative expenses	139,884	130,971	127,140
Operating income	29,348	27,012	20,428
Interest, net	2,245	2,137	1,874
Other (gains) and losses	794	3,027	1,538
Income before income taxes	26,309	21,848	17,016
Total assets	260,823	252,399	243,197
Depreciation and amortization	12,973	11,853	10,945
Capital expenditures	23,783	20,606	16,857
Corporate and support
Segment Reporting Information [Line Items]
Membership and other income	52	44	34
Operating, selling, general and administrative expenses	2,491	2,287	5,155
Operating income	(2,439)	(2,243)	(5,121)
Corporate
Segment Reporting Information [Line Items]
Total assets	13,939	12,799	10,282
Depreciation and amortization	1,458	1,381	1,318
Capital expenditures	2,927	2,777	2,080
Walmart U.S.
Segment Reporting Information [Line Items]
Net sales	462,415	441,817	420,553
Walmart U.S. | Operating Segments
Segment Reporting Information [Line Items]
Net sales	462,415	441,817	420,553
Membership and other income	2,594	1,985	1,845
Total revenues	465,009	443,802	422,398
Cost of sales	336,451	323,563	308,805
Operating, selling, general and administrative expenses	104,676	98,085	92,973
Operating income	23,882	22,154	20,620
Total assets	150,006	137,782	130,659
Depreciation and amortization	8,549	7,671	7,054
Capital expenditures	16,466	13,877	11,425
Walmart International
Segment Reporting Information [Line Items]
Net sales	121,885	114,641	100,983
Walmart International | Operating Segments
Segment Reporting Information [Line Items]
Net sales	121,885	114,641	100,983
Membership and other income	1,478	1,408	1,621
Total revenues	123,363	116,049	102,604
Cost of sales	95,267	89,831	79,332
Operating, selling, general and administrative expenses	22,595	21,309	20,307
Operating income	5,501	4,909	2,965
Total assets	80,016	86,136	86,766
Depreciation and amortization	2,260	2,159	1,964
Capital expenditures	3,178	2,911	2,625
Sam's Club U.S.
Segment Reporting Information [Line Items]
Net sales	90,238	86,179	84,345
Fuel-related expenses	9,900	10,600	12,100
Sam's Club U.S. | Operating Segments
Segment Reporting Information [Line Items]
Net sales	90,238	86,179	84,345
Membership and other income	2,323	2,051	1,908
Total revenues	92,561	88,230	86,253
Cost of sales	80,035	76,748	75,584
Operating, selling, general and administrative expenses	10,122	9,290	8,705
Operating income	2,404	2,192	1,964
Total assets	16,862	15,682	15,490
Depreciation and amortization	706	642	609
Capital expenditures	$ 1,212	$ 1,041	$ 727