Document And Entity Information - shares	6 Months Ended
	Jul. 31, 2019	Sep. 04, 2019
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jul. 31, 2019
Document Transition Report	false
Entity File Number	001-6991
Entity Registrant Name	WALMART INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	71-0415188
Entity Address, Address Line One	702 S.W. 8th Street
Entity Address, City or Town	Bentonville
Entity Address, State or Province	AR
Entity Address, Postal Zip Code	72716
City Area Code	479
Local Phone Number	273-4000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		2,844,284,080
Entity Central Index Key	0000104169
Current Fiscal Year End Date	--01-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Stock, par value $0.10 per share
Title of 12(b) Security	Common Stock, par value $0.10 per share
Trading Symbol	WMT
Security Exchange Name	NYSE
1.900% Notes Due 2022
Title of 12(b) Security	1.900% Notes Due 2022
Security Exchange Name	NYSE
No Trading Symbol Flag	true
2.550% Notes Due 2026
Title of 12(b) Security	2.550% Notes Due 2026
Security Exchange Name	NYSE
No Trading Symbol Flag	true