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			347.0
Beginning balances at Feb. 01, 2014	$ 3,989	$ 3,986	$ 35	$ 300	$ 3,159	$ 492	$ 3
Increase (Decrease) in Shareholders' Equity
Net earnings, nine months ended	715	714	0	0	714	0	1
Foreign currency translation adjustments	(22)	(22)	0	0	0	(22)	0
Unrealized losses on available-for-sale investments	(2)	(2)	0	0	0	(2)	0
Reclassification of foreign currency translation adjustments into earnings due to sale of business	0
Stock-based compensation	64	64	$ 0	64	0	0	0
Restricted stock vested and stock options exercised (in shares)			3.0
Restricted stock vested and stock options exercised	19	19	$ 0	19	0	0	0
Issuance of common stock under employee stock purchase plan (in shares)			0.0
Issuance of common stock under employee stock purchase plan	8	8	$ 0	8	0	0	0
Tax benefit (deficit) from stock options exercised, restricted stock vesting and employee stock purchase plan	(14)	(14)	0	(14)	0	0	0
Common stock dividends	(184)	(184)	$ 0	0	(184)	0	0
Ending balances (in shares) at Nov. 01, 2014			350.0
Ending balances at Nov. 01, 2014	4,573	4,569	$ 35	377	3,689	468	4
Beginning balances (in shares) at Jan. 31, 2015			352.0
Beginning balances at Jan. 31, 2015	5,000	4,995	$ 35	437	4,141	382	5
Increase (Decrease) in Shareholders' Equity
Net earnings, nine months ended	418	418	0	0	418	0	0
Foreign currency translation adjustments	(19)	(19)	0	0	0	(19)	0
Unrealized 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	80	80	$ 0	80
Restricted stock vested and stock options exercised (in shares)			4.0
Restricted stock vested and stock options exercised	36	36	$ 0	36	0	0	0
Issuance of common stock under employee stock purchase plan (in shares)			0.0
Issuance of common stock under employee stock purchase plan	7	7	$ 0	7	0	0	0
Tax benefit (deficit) from stock options exercised, restricted stock vesting and employee stock purchase plan	9	9	0	9	0	0	0
Common stock dividends	$ (421)	(421)	$ 0	3	(424)	0	0
Stock Repurchased During Period, Shares	11.3		(11.0)
Stock Repurchased During Period, Value	$ (388)	(388)	$ (1)	(387)
Ending balances (in shares) at Oct. 31, 2015			345.0
Ending balances at Oct. 31, 2015	$ 4,650	$ 4,650	$ 34	$ 185	$ 4,135	$ 296	$ 0