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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024	Feb. 28, 2026	Jan. 31, 2023	Nov. 30, 2022
Shareholders' Equity
Common stock, par (in USD per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	33,000,000,000.0	33,000,000,000.0
Preferred stock, par value (in dollars per share)	$ 0.10
Preferred stock, shares authorized (in shares)	100,000,000
Preferred stock, shares issued (in shares)	0
Preferred stock, shares outstanding (in shares)	0
Share-based compensation expense	$ 3,603	$ 2,769	$ 2,093
Purchase of noncontrolling interest			2,443
Proceeds from issuance or sale of equity	111	362	716
Tax benefit	$ 900	$ 700	500
Compensation awards (in shares)	215,000,000
Walmart International
Shareholders' Equity
Share-based compensation expense	$ 700
PhonePe
Shareholders' Equity
Liability to noncontrolling interest holders			$ 900
2022 Share Repurchase Program
Shareholders' Equity
Repurchase program						$ 20,000
Repurchase amount remaining	$ 4,000
2026 Share Repurchase Program \| Subsequent Event
Shareholders' Equity
Repurchase program				$ 30,000
PhonePe
Shareholders' Equity
Aggregate ownership, percent	73.00%	84.00%	84.00%		89.00%
Flipkart
Shareholders' Equity
Aggregate ownership, percent			85.00%		75.00%
Purchase of noncontrolling interest			$ 3,500
Common Stock
Shareholders' Equity
Common shares, outstanding (in shares)	8,000,000,000.0	8,000,000,000.0
Common shares, issued (in shares)	8,000,000,000.0	8,000,000,000.0
Restricted Stock Units
Shareholders' Equity
Expected dividend rate	1.50%	2.00%	2.20%
Unrecognized compensation cost	$ 2,239	$ 2,243	$ 1,686
Restricted Stock Units \| Grants Made In Fiscal 2023 or Later \| Quarterly
Shareholders' Equity
Award vesting rights, percentage	8.00%
Restricted Stock Units \| Grants Made In Fiscal 2023 or Later \| Annual
Shareholders' Equity
Vesting period	3 years
Restricted Stock Units \| Grants Made in Fiscal 2020 Through Fiscal 2022 \| Annual
Shareholders' Equity
Award vesting rights, percentage	25.00%
Vesting period	4 years
Restricted stock units
Shareholders' Equity
Share-based compensation expense	$ 2,028	$ 1,909	$ 1,258
Performance-based Restrict Stock Units
Shareholders' Equity
Vesting period	2 years
Expected dividend rate	2.40%	3.20%	3.30%
Performance period	1 year
Option
Shareholders' Equity
Unrecognized compensation costs, options	$ 3,000
Minimum \| Restricted stock units
Shareholders' Equity
Vesting period	1 month
Minimum \| Performance-based Restrict Stock Units
Shareholders' Equity
Award vesting rights, percentage	0.00%
Vesting period	1 year
Maximum \| Restricted stock units
Shareholders' Equity
Vesting period	3 years
Maximum \| Performance-based Restrict Stock Units
Shareholders' Equity
Award vesting rights, percentage	150.00%
Vesting period	3 years