Condensed Consolidated Statement Of Shareholders' Equity (Unaudited) - 6 months ended Jul. 31, 2017 - 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 at Jan. 31, 2017	$ 80,535	$ 305	$ 2,371	$ 89,354	$ (14,232)	$ 77,798	$ 2,737
Balances, in shares at Jan. 31, 2017		3,048
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income	6,256			5,938		5,938	318
Other comprehensive income (loss), net of income taxes	3,419				3,132	3,132	287
Cash dividends declared	(6,142)			(6,142)		(6,142)
Purchase of Company stock	(4,426)	$ (6)	(114)	(4,306)		(4,426)
Purchase of Company stock (in shares)		(60)
Dividends declared to noncontrolling interest	(679)						(679)
Other, in shares		5
Other	83		95	(6)		89	(6)
Balances at Jul. 31, 2017	$ 79,046	$ 299	$ 2,352	$ 84,838	$ (11,100)	$ 76,389	$ 2,657
Balances, in shares at Jul. 31, 2017		2,993