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Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax, Sam's Club (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
Sam's Club U.S.
Revenue from External Customer [Line Items]
Net sales	23,638	22,853	45,702	44,288
Sam's Club U.S. | eCommerce
Revenue from External Customer [Line Items]
Net sales	3,700	3,000	7,100	5,600
Grocery | Sam's Club U.S.
Revenue from External Customer [Line Items]
Net sales	16,417	15,315	31,860	29,889
Fuel and other | Sam's Club U.S.
Revenue from External Customer [Line Items]
Net sales	3,064	3,522	5,915	6,856
General merchandise | Sam's Club U.S.
Revenue from External Customer [Line Items]
Net sales	2,877	2,850	5,413	5,327
Health and wellness | Sam's Club U.S.
Revenue from External Customer [Line Items]
Net sales	$ 1,280	$ 1,166	$ 2,514	$ 2,216

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