Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 6,439	$ 3,680	$ 10,513	$ 7,586
Consolidated net (income) loss attributable to noncontrolling interest	37	(70)	(47)	(134)
Consolidated net income attributable to Walmart	6,476	3,610	10,466	7,452
Other comprehensive income (loss), net of income taxes
Currency translation and other	298	(81)	(3,670)	426
Net investment hedges	(191)	140	(34)	248
Cash flow hedges	313	(158)	34	(289)
Minimum pension liability	16	4	31	5
Other Comprehensive Income (Loss), Net of Tax	436	(95)	(3,639)	390
Other comprehensive (income) loss attributable to noncontrolling interest	(52)	(84)	660	(118)
Other comprehensive income (loss) attributable to Walmart	384	(179)	(2,979)	272
Comprehensive income, net of income taxes	6,875	3,585	6,874	7,976
Comprehensive (income) loss attributable to noncontrolling interest	(15)	(154)	613	(252)
Comprehensive income attributable to Walmart	$ 6,860	$ 3,431	$ 7,487	$ 7,724