Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 2,811	$ 4,074
Consolidated net income attributable to noncontrolling interest	(81)	(84)
Consolidated net income attributable to Walmart	2,730	3,990
Other comprehensive income (loss), net of income taxes
Currency translation and other	2,959	(3,968)
Net investment hedges	(1,202)	157
Cash flow hedges	20	(279)
Minimum pension liability	1,969	15
Other comprehensive income (loss), net of income taxes	3,746	(4,075)
Other comprehensive loss attributable to noncontrolling interest	74	712
Other comprehensive income (loss) attributable to Walmart	3,820	(3,363)
Comprehensive income (loss), net of income taxes	6,557	(1)
Comprehensive (income) loss attributable to noncontrolling interest	(7)	628
Comprehensive income attributable to Walmart	$ 6,550	$ 627