Condensed Consolidated Statement Of Shareholders' Equity (Unaudited) - 9 months ended Oct. 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, in shares at Jan. 31, 2017		3,048
Balances at Jan. 31, 2017	$ 80,535	$ 305	$ 2,371	$ 89,354	$ (14,232)	$ 77,798	$ 2,737
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income	8,160			7,687		7,687	473
Other comprehensive income (loss), net of income taxes	3,332				3,099	3,099	233
Cash dividends declared	(6,142)			(6,142)		(6,142)
Purchase of Company stock (in shares)		(87)
Purchase of Company stock	(6,595)	$ (9)	(172)	(6,414)		(6,595)
Dividends declared to noncontrolling interest	(684)						(684)
Other, in shares		7
Other	300	$ 1	302	(5)		298	2
Balances, in shares at Oct. 31, 2017		2,968
Balances at Oct. 31, 2017	$ 78,906	$ 297	$ 2,501	$ 84,480	$ (11,133)	$ 76,145	$ 2,761