Segments and Disaggregated Revenue (Schedule of Segment Reporting Information by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 567,762	$ 555,233	$ 519,926
Operating income (loss)	25,942	22,548	20,568
Interest, net	(1,836)	(2,194)	(2,410)
Loss on extinguishment of debt	(2,410)	0	0
Other gains and (losses)	(3,000)	210	1,958
Income before income taxes	18,696	20,564	20,116
Total assets	244,860	252,496	236,495
Depreciation and amortization	10,658	11,152	10,987
Capital expenditures	13,106	10,264	10,705
Walmart U S [Member]
Segment Reporting Information [Line Items]
Net sales	393,247	369,963	341,004
Operating income (loss)	21,587	19,116	17,380
Total assets	125,044	113,490	110,353
Depreciation and amortization	6,773	6,561	6,408
Capital expenditures	8,475	6,131	6,315
Walmart International [Member]
Segment Reporting Information [Line Items]
Net sales	100,959	121,360	120,130
Operating income (loss)	3,758	3,660	3,370
Total assets	91,403	109,445	105,811
Depreciation and amortization	1,963	2,633	2,682
Capital expenditures	2,497	2,436	2,801
Sams Club [Member]
Segment Reporting Information [Line Items]
Net sales	73,556	63,910	58,792
Operating income (loss)	2,259	1,906	1,642
Total assets	14,678	13,415	13,494
Depreciation and amortization	601	599	605
Capital expenditures	622	488	525
Corporate and support [Member]
Segment Reporting Information [Line Items]
Net sales	0	0	0
Operating income (loss)	(1,662)	(2,134)	(1,824)
Total assets	13,735	16,146	6,837
Depreciation and amortization	1,321	1,359	1,292
Capital expenditures	$ 1,512	$ 1,209	$ 1,064