Retirement-Related Benefits - Narrative (Details)	12 Months Ended
Jan. 31, 2024
Contribution expense from retirement plans [Line Items]
Defined contribution plan, employer matching contribution, percent of match	100.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay	6.00%
Vesting percentage of matching contribution to eligible associates	100.00%
Defined contribution plan, maximum annual contributions per employee, percent	50.00%
PUERTO RICO
Contribution expense from retirement plans [Line Items]
Defined contribution plan, requisite service period for eligibility (in years)	1 year

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

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Period Type:	duration

Percentage employer matches of the employee's percentage contribution matched.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

[Line Items] for Contribution expense from retirement plans [Table]

No definition available.

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Defined Contribution Plan, Requisite Service Period For Eligibility

No definition available.

Name:	wmt_DefinedContributionPlanRequisiteServicePeriodForEligibility
Namespace Prefix:	wmt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Name:	srt_StatementGeographicalAxis=country_PR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: