Restructuring Charges Restructuring Accrual Activity (Details) - USD ($) $ in Millions		12 Months Ended
		Feb. 02, 2019	Feb. 03, 2018
Best Buy Mobile
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at beginning of period		$ 8	$ 0
Charges		50	8
Cash payments		(54)
Adjustments	[1]	(3)
Restructuring reserve, balance at end of period		1	8
Best Buy Mobile | Employee termination benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at beginning of period		8	0
Charges		1	8
Cash payments		(6)
Adjustments	[1]	(3)
Restructuring reserve, balance at end of period		0	8
Best Buy Mobile | Facility closure and other costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at beginning of period		0	0
Charges		49	0
Cash payments		(48)
Adjustments	[1]	0
Restructuring reserve, balance at end of period		1	0
Canadian brand consolidation | Facility closure and other costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at beginning of period		15	34
Cash payments		(7)	(18)
Adjustments	[2]	(1)	(2)
Changes in foreign currency exchange rates			1
Restructuring reserve, balance at end of period		$ 7	$ 15

[1] (1)Adjustments to termination benefits represent changes in retention assumptions.

[2] Adjustments related to facility closure and other costs represent changes in sublease assumptions.