Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss)	$ 3,680	$ (727)	$ 7,586	$ 1,549
Consolidated net income attributable to noncontrolling interest	(70)	(134)	(134)	(276)
Consolidated net income (loss) attributable to Walmart	3,610	(861)	7,452	1,273
Other comprehensive income (loss), net of income taxes
Currency translation and other	(81)	(2,685)	426	(1,220)
Net investment hedges	140	193	248	261
Cash flow hedges	(158)	(155)	(289)	(232)
Minimum pension liability	4	9	5	52
Other comprehensive income (loss), net of income taxes	(95)	(2,638)	390	(1,139)
Other comprehensive (income) loss attributable to noncontrolling interest	(84)	290	(118)	127
Other comprehensive income (loss) attributable to Walmart	(179)	(2,348)	272	(1,012)
Comprehensive income (loss), net of income taxes	3,585	(3,365)	7,976	410
Comprehensive (income) loss attributable to noncontrolling interest	(154)	156	(252)	(149)
Comprehensive income (loss) attributable to Walmart	$ 3,431	$ (3,209)	$ 7,724	$ 261