Acquisitions, Disposals, and Related Items Acquisitions, Disposals, and Related Items (Details) - USD ($) $ in Millions				6 Months Ended
	Jul. 01, 2015	May. 12, 2014	Feb. 01, 2014	Jul. 31, 2015	Jul. 31, 2014
Significant Acquisitions and Disposals [Line Items]
Proceeds from the disposal of certain operations				$ 246	$ 671
Walmart Chile [Member]
Significant Acquisitions and Disposals [Line Items]
Purchase of Interests of Noncontrolling Interest			$ 1,500
Sale of Stock, Percentage of Ownership after Transaction			99.70%
Yihaodian [Member]
Significant Acquisitions and Disposals [Line Items]
Purchase of Interests of Noncontrolling Interest	$ 760
Vips restaurant business [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from the disposal of certain operations		$ 671
Gain (Loss) on Disposition of Business		$ 262