Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 3,885	$ 3,825	$ 12,045	$ 11,880
Less consolidated net income attributable to nonredeemable noncontrolling interest	(131)	(176)	(407)	(448)
Less consolidated net income attributable to redeemable noncontrolling interest	(16)	(14)	(47)	(39)
Consolidated net income attributable to Walmart	3,738	3,635	11,591	11,393
Other comprehensive income (loss), net of income taxes
Currency translation and other	724	876	(2,171)	1,232
Derivative instruments	0	250	180	(135)
Minimum pension liability	1	(1)	117	3
Other comprehensive income (loss), net of income taxes	725	1,125	(1,874)	1,100
Less other comprehensive income attributable to nonredeemable noncontrolling interest	(15)	(122)	240	(196)
Less other comprehensive income attributable to redeemable noncontrolling interest	(4)	(34)	38	(56)
Other comprehensive income attributable to Walmart	706	969	(1,596)	848
Comprehensive income, net of income taxes	4,610	4,950	10,171	12,980
Less comprehensive income (loss) attributable to nonredeemable noncontrolling interest	(146)	(298)	(167)	(644)
Less comprehensive income (loss) attributable to redeemable noncontrolling interest	(20)	(48)	(9)	(95)
Comprehensive income attributable to Walmart	$ 4,444	$ 4,604	$ 9,995	$ 12,241