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, three months ended	129	129	0		0	129	0	0
Foreign currency translation adjustments	15	15	0		0	0	15	0
Reclassification of foreign currency translation adjustments into earnings due to sale of business	(67)	(67)					(67)	0
Sale of noncontrolling interest	(5)		0		0	0		(5)
Dividends		0	0		0	0	0
Stock-based compensation	27	27	$ 0		27	0	0	0
Restricted stock vested and stock options exercised (in shares)			1
Restricted stock vested and stock options exercised	22	22	$ 0		22	0	0	0
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	5	5	0		5	0	0	0
Common stock dividends	(261)	(261)	$ 0		0	(261)	0	0
Ending balances (in shares) at May. 02, 2015			353
Ending balances at May. 02, 2015	4,868	4,868	$ 35		494	4,009	330	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, three months ended	229	229	0		0	229	0	0
Foreign currency translation adjustments	45	45	0		0	0	45	0
Reclassification of foreign currency translation adjustments into earnings due to sale of business	0
Stock-based compensation	31	31	$ 0		31
Restricted stock vested and stock options exercised (in shares)			3
Restricted stock vested and stock options exercised	18	18	$ 1		17	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	6	6	0		6	0	0	0
Common stock dividends	(238)	(238)	$ 0		0	(238)	0	0
Stock Repurchased During Period, Shares			(3)
Stock Repurchased During Period, Value	(101)	(101)	$ (1)		(57)	(43)
Ending balances (in shares) at Apr. 30, 2016			324
Ending balances at Apr. 30, 2016	$ 4,426	$ 4,426	$ 32	$ 0	$ 0	$ 4,078	$ 316	$ 0