Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 3,321	$ 1,817	$ 10,907	$ 3,366
Consolidated net income attributable to noncontrolling interest	(33)	(107)	(167)	(383)
Consolidated net income attributable to Walmart	3,288	1,710	10,740	2,983
Other comprehensive income (loss), net of income taxes
Currency translation and other	(1,188)	1,020	(762)	(200)
Net investment hedges	(113)	114	135	375
Cash flow hedges	(12)	(109)	(301)	(341)
Minimum pension liability	8	12	13	64
Other comprehensive income (loss), net of income taxes	(1,305)	1,037	(915)	(102)
Other comprehensive (income) loss attributable to noncontrolling interest	193	123	75	250
Other comprehensive income (loss) attributable to Walmart	(1,112)	1,160	(840)	148
Comprehensive income, net of income taxes	2,016	2,854	9,992	3,264
Comprehensive (income) loss attributable to noncontrolling interest	160	16	(92)	(133)
Comprehensive income attributable to Walmart	$ 2,176	$ 2,870	$ 9,900	$ 3,131