Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 4,364	$ 6,439	$ 7,175	$ 10,513
Consolidated net (income) loss attributable to noncontrolling interest	(88)	37	(169)	(47)
Consolidated net income attributable to Walmart	4,276	6,476	7,006	10,466
Other comprehensive income (loss), net of income taxes
Currency translation and other	201	298	3,160	(3,670)
Net investment hedges	0	(191)	(1,202)	(34)
Cash flow hedges	(155)	313	(135)	34
Minimum pension liability	2	16	1,971	31
Other comprehensive income (loss), net of income taxes	48	436	3,794	(3,639)
Other comprehensive (income) loss attributable to noncontrolling interest	(78)	(52)	(4)	660
Other comprehensive income (loss) attributable to Walmart	(30)	384	3,790	(2,979)
Comprehensive income, net of income taxes	4,412	6,875	10,969	6,874
Comprehensive (income) loss attributable to noncontrolling interest	(166)	(15)	(173)	613
Comprehensive income attributable to Walmart	$ 4,246	$ 6,860	$ 10,796	$ 7,487