Condensed Consolidated Statement Of Shareholders' Equity (Unaudited) - 6 months ended Jul. 31, 2018 - USD ($) shares in Millions, $ in Millions	Total	Common stock	Capital in excess of par value	Retained earnings	Accumulated other comprehensive income (loss)	Total Walmart shareholders' equity	Noncontrolling interest
Balances, in shares at Jan. 31, 2018		2,952
Balances at Jan. 31, 2018	$ 80,822	$ 295	$ 2,648	$ 85,107	$ (10,181)	$ 77,869	$ 2,953
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	924			2,361	(1,436)	925	(1)
Consolidated net income	1,549			1,273		1,273	276
Other comprehensive income (loss), net of income taxes	(1,139)				(1,012)	(1,012)	(127)
Cash dividends declared	(6,121)			(6,121)		(6,121)
Purchase of Company stock (in shares)		(21)
Purchase of Company stock	(1,874)	$ (2)	(56)	(1,816)		(1,874)
Dividends declared to noncontrolling interest	(480)						(480)
Other, in shares		4
Other	131	$ 1	118	6		125	6
Balances, in shares at Jul. 31, 2018		2,935
Balances at Jul. 31, 2018	$ 73,812	$ 294	$ 2,710	$ 80,810	$ (12,629)	$ 71,185	$ 2,627