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, nine months ended	418	418	0		0	418	0	0
Foreign currency translation adjustments	(19)	(19)	0		0	0	(19)	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	80	80	$ 0		80	0	0	0
Restricted stock vested and stock options exercised (in shares)			4
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
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)
Stock Repurchased During Period, Value	(388)	(388)	$ (1)		(387)	0
Ending balances (in shares) at Oct. 31, 2015			345
Ending balances at Oct. 31, 2015	4,650	4,650	$ 34		185	4,135	296	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, nine months ended	621	621	0		0	621	0	0
Foreign currency translation adjustments	6	6	0		0	0	6	0
Reclassification of foreign currency translation adjustments into earnings due to sale of business	0
Stock-based compensation	82	82	$ 0		82
Restricted stock vested and stock options exercised (in shares)			5
Restricted stock vested and stock options exercised	60	60	$ 1		59	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	7	7	$ 0		7	0	0	0
Tax benefit (deficit) from stock options exercised, restricted stock vesting and employee stock purchase plan	(3)	(3)	0		(3)	0	0	0
Common stock dividends	(417)	(417)	$ 0		0	(417)	0	0
Stock Repurchased During Period, Shares			(16)
Stock Repurchased During Period, Value	(528)	(528)	$ 2		(145)	(381)
Ending balances (in shares) at Oct. 29, 2016			313
Ending balances at Oct. 29, 2016	$ 4,261	$ 4,261	$ 31	$ 0	$ 0	$ 3,953	$ 277	$ 0