Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Consolidated net income	$ 3,945	$ 3,894
Less consolidated net income attributable to nonredeemable noncontrolling interest	(144)	(143)
Less consolidated net income attributable to redeemable noncontrolling interest	(17)	(9)
Consolidated net income attributable to Walmart	3,784	3,742
Other comprehensive income, net of income taxes
Currency translation and other	(1,392)	1,472
Derivative instruments	(81)	(63)
Minimum pension liability	108	7
Other comprehensive income (loss), net of income taxes	(1,365)	1,416
Less other comprehensive income attributable to nonredeemable noncontrolling interest	(9)	(431)
Less other comprehensive income attributable to redeemable noncontrolling interest	(7)	(38)
Other comprehensive income attributable to Walmart	(1,381)	947
Comprehensive income, net of income taxes	2,580	5,310
Less comprehensive income attributable to nonredeemable noncontrolling interest	(153)	(574)
Less comprehensive income attributable to redeemable noncontrolling interest	(24)	(47)
Comprehensive income attributable to Walmart	$ 2,403	$ 4,689