Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 4,074	$ 3,906
Consolidated net income attributable to noncontrolling interest	(84)	(64)
Consolidated net income attributable to Walmart	3,990	3,842
Other comprehensive income (loss), net of income taxes
Currency translation and other	(3,968)	507
Net investment hedges	157	108
Cash flow hedges	(279)	(131)
Minimum pension liability	15	1
Other comprehensive income (loss), net of income taxes	(4,075)	485
Other comprehensive (income) loss attributable to noncontrolling interest	712	(34)
Other comprehensive income (loss) attributable to Walmart	(3,363)	451
Comprehensive income (loss), net of income taxes	(1)	4,391
Comprehensive income (loss) attributable to noncontrolling interest	628	(98)
Comprehensive income attributable to Walmart	$ 627	$ 4,293