Accumulated Other Comprehensive Loss (Composition of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	$ 87,531	$ 81,552	$ 79,634
Other comprehensive income (loss) before reclassifications, net	(1,133)	7	(1,279)
Reclassifications related to business dispositions, net	4,059
Reclassifications to income, net	74	1,032	16
Ending balances	91,891	87,531	81,552
Currency Translation and Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(10,772)	(11,827)	(12,085)
Other comprehensive income (loss) before reclassifications, net	(586)	214	281
Reclassifications related to business dispositions, net	3,258
Reclassifications to income, net	0	841	(23)
Ending balances	(8,100)	(10,772)	(11,827)
Currency Translation and Other | Walmart Argentina [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications to income, net		800
Net Investment Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	1,296	1,517	1,395
Other comprehensive income (loss) before reclassifications, net	(7)	(221)	122
Reclassifications related to business dispositions, net	(1,195)
Reclassifications to income, net	0	0	0
Ending balances	94	1,296	1,517
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(304)	(539)	(140)
Other comprehensive income (loss) before reclassifications, net	(540)	186	(399)
Reclassifications related to business dispositions, net	30
Reclassifications to income, net	66	49	0
Ending balances	(748)	(304)	(539)
Minimum Pension Liability
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(1,986)	(1,956)	(712)
Other comprehensive income (loss) before reclassifications, net	0	(172)	(1,283)
Reclassifications related to business dispositions, net	1,966
Reclassifications to income, net	8	142	39
Ending balances	(12)	(1,986)	(1,956)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(11,766)	(12,805)	(11,542)
Ending balances	$ (8,766)	$ (11,766)	$ (12,805)