Condensed Consolidated Statement Of Shareholders' Equity (Unaudited) - 3 months ended Apr. 30, 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]
Adoption of new accounting standards on February 1, 2018	924			2,361	(1,436)	925	(1)
Consolidated net income	2,276			2,134		2,134	142
Other comprehensive income (loss), net of income taxes	1,499				1,336	1,336	163
Cash dividends declared	(6,135)			(6,135)		(6,135)
Purchase of Company stock (in shares)		(5)
Purchase of Company stock	(508)	$ (1)	(15)	(492)		(508)
Dividends declared to noncontrolling interest	(489)						(489)
Other, in shares		4
Other	(65)		(76)	7		(69)	4
Balances, in shares at Apr. 30, 2018		2,951
Balances at Apr. 30, 2018	$ 78,324	$ 294	$ 2,557	$ 82,982	$ (10,281)	$ 75,552	$ 2,772