Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 5,201	$ 3,321	$ 15,714	$ 10,907
Consolidated net income attributable to noncontrolling interest	(66)	(33)	(113)	(167)
Consolidated net income attributable to Walmart	5,135	3,288	15,601	10,740
Other comprehensive income (loss), net of income taxes
Currency translation and other	1,262	(1,188)	(2,408)	(762)
Net investment hedges	(1)	(113)	(35)	135
Cash flow hedges	0	(12)	34	(301)
Minimum pension liability	16	8	47	13
Other comprehensive income (loss), net of income taxes	1,277	(1,305)	(2,362)	(915)
Other comprehensive (income) loss attributable to noncontrolling interest	(109)	193	551	75
Other comprehensive income (loss) attributable to Walmart	1,168	(1,112)	(1,811)	(840)
Comprehensive income, net of income taxes	6,478	2,016	13,352	9,992
Comprehensive (income) loss attributable to noncontrolling interest	(175)	160	438	(92)
Comprehensive income attributable to Walmart	$ 6,303	$ 2,176	$ 13,790	$ 9,900