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Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax Walmart U.S (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 U.S.
Revenue from External Customer [Line Items]
Net sales	120,911	115,347	233,074	224,017
Walmart U.S. | eCommerce
Revenue from External Customer [Line Items]
Net sales	23,700	18,900	45,100	36,500
Grocery | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	71,092	68,680	138,923	135,111
General merchandise | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	29,458	28,980	54,734	54,691
Health and wellness | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	17,248	15,030	33,492	29,279
Other categories | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	$ 3,113	$ 2,657	$ 5,925	$ 4,936

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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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