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Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax, International (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Revenue from External Customer [Line Items]
Net sales	$ 175,750	$ 167,767	$ 339,731	$ 327,705
Walmart International
Revenue from External Customer [Line Items]
Net sales	31,201	29,567	60,955	59,400
Walmart International | eCommerce
Revenue from External Customer [Line Items]
Net sales	8,300	6,800	16,000	13,200
Mexico and Central America | Walmart International
Revenue from External Customer [Line Items]
Net sales	12,546	13,099	24,260	26,331
China | Walmart International
Revenue from External Customer [Line Items]
Net sales	5,786	4,440	12,365	9,883
Canada | Walmart International
Revenue from External Customer [Line Items]
Net sales	6,114	5,891	11,259	11,219
Other | Walmart International
Revenue from External Customer [Line Items]
Net sales	$ 6,755	$ 6,137	$ 13,071	$ 11,967

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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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