Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 3,826	$ 3,885	$ 11,911	$ 12,045
Less consolidated net income attributable to nonredeemable noncontrolling interest	(115)	(131)	(514)	(407)
Less consolidated net income attributable to redeemable noncontrolling interest	0	(16)	0	(47)
Consolidated net income attributable to Walmart	3,711	3,738	11,397	11,591
Other comprehensive income (loss), net of income taxes
Currency translation and other	(2,340)	724	(1,328)	(2,171)
Derivative instruments	(161)	0	(165)	180
Minimum pension liability	10	1	16	117
Other comprehensive income (loss), net of income taxes	(2,491)	725	(1,477)	(1,874)
Less other comprehensive income (loss) attributable to nonredeemable noncontrolling interest	197	(15)	222	240
Less other comprehensive income (loss) attributable to redeemable noncontrolling interest	0	(4)	0	38
Other comprehensive income (loss) attributable to Walmart	(2,294)	706	(1,255)	(1,596)
Comprehensive income, net of income taxes	1,335	4,610	10,434	10,171
Less comprehensive income attributable to nonredeemable noncontrolling interest	82	(146)	(292)	(167)
Less comprehensive income attributable to redeemable noncontrolling interest	0	(20)	0	(9)
Comprehensive income attributable to Walmart	$ 1,417	$ 4,444	$ 10,142	$ 9,995