CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Total Best Buy Co., Inc. [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Beginning balances (in shares) at Feb. 01, 2014			347
Beginning balances at Feb. 01, 2014	$ 3,989	$ 3,986	$ 35	$ 300	$ 3,159	$ 492	$ 3
Increase (Decrease) in Shareholders' Equity
Net earnings, six months ended	608	607	0	0	607	0	1
Foreign currency translation adjustments	3	3	0	0	0	3	0
Unrealized gains (losses) on available-for-sale investments	(1)	(1)	0	0	0	(1)	0
Reclassification of foreign currency translation adjustments into earnings due to sale of business	0
Stock-based compensation	41	41	$ 0	41	0	0	0
Restricted stock vested and stock options exercised (in shares)			2
Restricted stock vested and stock options exercised	13	13	$ 0	13	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	(10)	(10)	0	(10)	0	0	0
Common stock dividends	(117)	(117)	$ 0	0	(117)	0	0
Ending balances (in shares) at Aug. 02, 2014			349
Ending balances at Aug. 02, 2014	4,530	4,526	$ 35	348	3,649	494	4
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
Unrealized gains (losses) on available-for-sale investments	0
Reclassification of foreign currency translation adjustments into earnings due to sale of business	(67)	(67)	0	0	0	(67)	0
Sale of noncontrolling interest	(5)	0	0	0	0	0	(5)
Stock-based compensation	55	55	$ 0	55
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)
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