Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax, International (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2026	Apr. 30, 2025
Revenue from External Customer [Line Items]
Net sales	$ 175,684	$ 163,981
Walmart International
Revenue from External Customer [Line Items]
Net sales	35,110	29,754
Walmart International \| eCommerce
Revenue from External Customer [Line Items]
Net sales	9,700	7,700
Mexico and Central America \| Walmart International
Revenue from External Customer [Line Items]
Net sales	13,847	11,714
China \| Walmart International
Revenue from External Customer [Line Items]
Net sales	8,454	6,579
Canada \| Walmart International
Revenue from External Customer [Line Items]
Net sales	5,727	5,145
Other \| Walmart International
Revenue from External Customer [Line Items]
Net sales	$ 7,082	$ 6,316

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details