CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Total Best Buy Co., Inc. [Member]	Common Stock [Member]	Prepaid Share Repurchase [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Beginning balances (in shares) at Jan. 31, 2015			352
Beginning balances at Jan. 31, 2015	$ 5,000	$ 4,995	$ 35		$ 437	$ 4,141	$ 382	$ 5
Increase (Decrease) in Shareholders' Equity
Net earnings, six months ended	293	293	0		0	293	0	0
Foreign currency translation adjustments	(17)	(17)	0		0	0	(17)	0
Reclassification of foreign currency translation adjustments into earnings due to sale of business	(67)	(67)					(67)	0
Sale of noncontrolling interest	(5)							(5)
Stock-based compensation	55	55	$ 0		55	0	0	0
Restricted stock vested and stock options exercised (in shares)			1
Restricted stock vested and stock options exercised	24	24	$ 0		24	0	0	0
Issuance of common stock under employee stock purchase plan (in shares)			0
Issuance of common stock under employee stock purchase plan	4	4	$ 0		4	0	0	0
Tax benefit (deficit) from stock options exercised, restricted stock vesting and employee stock purchase plan	1	1	0		1	0	0	0
Common stock dividends	(342)	(342)	$ 0		0	(342)	0	0
Stock Repurchased During Period, Shares			(9)
Stock Repurchased During Period, Value	(324)	(324)	$ (1)		(323)	0
Ending balances (in shares) at Aug. 01, 2015			344
Ending balances at Aug. 01, 2015	4,622	4,622	$ 34		198	4,092	298	0
Beginning balances (in shares) at Jan. 30, 2016			324
Beginning balances at Jan. 30, 2016	4,378	4,378	$ 32	$ (55)	0	4,130	271	0
Increase (Decrease) in Shareholders' Equity
Net earnings, six months ended	427	427	0		0	427	0	0
Foreign currency translation adjustments	25	25	0			0	25	0
Reclassification of foreign currency translation adjustments into earnings due to sale of business	0
Stock-based compensation	57	57	$ 0		57
Restricted stock vested and stock options exercised (in shares)			3
Restricted stock vested and stock options exercised	20	20	$ 0		20	0	0	0
Settlement of accelerated share repurchase	55	55		55
Issuance of common stock under employee stock purchase plan (in shares)			0
Issuance of common stock under employee stock purchase plan	3	3	$ 0		3	0	0	0
Tax benefit (deficit) from stock options exercised, restricted stock vesting and employee stock purchase plan	4	4	0		4	0	0	0
Common stock dividends	(328)	(328)	$ 0		0	(328)	0	0
Stock Repurchased During Period, Shares			(10)
Stock Repurchased During Period, Value	(322)	(322)	$ 0		(84)	(238)
Ending balances (in shares) at Jul. 30, 2016			317
Ending balances at Jul. 30, 2016	$ 4,319	$ 4,319	$ 32	$ 0	$ 0	$ 3,991	$ 296	$ 0