Acquisitions, Disposals, and Related Items Acquisitions, Disposals, and Related Items (Details) (USD $)	3 Months Ended	12 Months Ended
	Apr. 30, 2014	Jan. 31, 2014
Redeemable Noncontrolling Interest, Change in Redemption Value		$ 1,000,000,000
Redemption Value of Redeemable Noncontrolling Interest	1,500,000,000
Agreed Upon Sales Price	$ 625,000,000
Walmart Chile Ownership Percentage [Member]
Sale of Stock, Percentage of Ownership after Transaction	99.70%