Segments and Disaggregated Revenue (Segment Revenues and Long-Lived Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 572,754	$ 559,151	$ 523,964
Total long-lived assets	112,624	109,848	127,049
UNITED STATES [Member]
Segment Reporting Information [Line Items]
Total revenues	470,295	436,649	402,532
Total long-lived assets	89,795	87,068	86,944
Walmart International [Member]
Segment Reporting Information [Line Items]
Total revenues	102,459	122,502	121,432
Total long-lived assets	$ 22,829	$ 22,780	$ 40,105