Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 13,706	$ 15,201	$ 7,179
Consolidated net income attributable to noncontrolling interest	(196)	(320)	(509)
Consolidated net income attributable to Walmart	13,510	14,881	6,670
Other comprehensive income (loss), net of income taxes
Currency translation and other	842	286	(226)
Net investment hedges	(221)	122	272
Cash flow hedges	235	(399)	(290)
Minimum pension liability	(30)	(1,244)	131
Other comprehensive income (loss), net of income taxes	826	(1,235)	(113)
Other comprehensive (income) loss attributable to noncontrolling interest	213	(28)	188
Other comprehensive income (loss) attributable to Walmart	1,039	(1,263)	75
Comprehensive income, net of income taxes	14,532	13,966	7,066
Comprehensive (income) loss attributable to noncontrolling interest	17	(348)	(321)
Comprehensive income attributable to Walmart	$ 14,549	$ 13,618	$ 6,745