Segments and Disaggregated Revenue (Schedule of Segment Reporting Information by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 605,881	$ 567,762	$ 555,233
Operating income (loss)	20,428	25,942	22,548
Interest, net	(1,874)	(1,836)	(2,194)
Loss on extinguishment of debt	0	(2,410)	0
Other gains and (losses)	(1,538)	(3,000)	210
Income before income taxes	17,016	18,696	20,564
Total assets	243,197	244,860	252,496
Depreciation and amortization	10,945	10,658	11,152
Capital expenditures	16,857	13,106	10,264
Walmart U.S.
Segment Reporting Information [Line Items]
Net sales	420,553	393,247	369,963
Operating income (loss)	20,620	21,587	19,116
Total assets	130,659	125,044	113,490
Depreciation and amortization	7,054	6,773	6,561
Capital expenditures	11,425	8,475	6,131
Walmart International
Segment Reporting Information [Line Items]
Net sales	100,983	100,959	121,360
Operating income (loss)	2,965	3,758	3,660
Total assets	86,766	91,403	109,445
Depreciation and amortization	1,964	1,963	2,633
Capital expenditures	2,625	2,497	2,436
Sam's Club
Segment Reporting Information [Line Items]
Net sales	84,345	73,556	63,910
Operating income (loss)	1,964	2,259	1,906
Total assets	15,490	14,678	13,415
Depreciation and amortization	609	601	599
Capital expenditures	727	622	488
Corporate and support
Segment Reporting Information [Line Items]
Net sales	0	0	0
Operating income (loss)	(5,121)	(1,662)	(2,134)
Total assets	10,282	13,735	16,146
Depreciation and amortization	1,318	1,321	1,359
Capital expenditures	$ 2,080	$ 1,512	$ 1,209