Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Consolidated net income	$ 4,215	$ 4,161	$ 8,160	$ 8,055
Less consolidated net income attributable to nonredeemable noncontrolling interest	(132)	(129)	(276)	(272)
Less consolidated net income attributable to redeemable noncontrolling interest	(14)	(16)	(31)	(25)
Consolidated net income attributable to Walmart	4,069	4,016	7,853	7,758
Other comprehensive income (loss), net of income taxes
Currency translation and other	(1,503)	(1,116)	(2,895)	356
Derivative instruments	261	(322)	180	(385)
Minimum pension liability	8	(3)	116	4
Other comprehensive income (loss), net of income taxes	(1,234)	(1,441)	(2,599)	(25)
Less other comprehensive income attributable to nonredeemable noncontrolling interest	264	357	255	(74)
Less other comprehensive income attributable to redeemable noncontrolling interest	49	16	42	(22)
Other comprehensive income attributable to Walmart	(921)	(1,068)	(2,302)	(121)
Comprehensive income, net of income taxes	2,981	2,720	5,561	8,030
Less comprehensive income (loss) attributable to nonredeemable noncontrolling interest	132	228	(21)	(346)
Less comprehensive income (loss) attributable to redeemable noncontrolling interest	35	0	11	(47)
Comprehensive income attributable to Walmart	$ 3,148	$ 2,948	$ 5,551	$ 7,637