Restructuring Charges Restructuring Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Nov. 03, 2018 USD ($)	Oct. 28, 2017 USD ($)	Nov. 03, 2018 USD ($) store	Oct. 28, 2017 USD ($)	Feb. 03, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ (2)	$ 47	$ 0
Best Buy Mobile
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	$ 47	0
Number of Stores to be Closed | store			257
Restructuring Reserve	1		$ 1		$ 8
Canadian brand consolidation
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	2	0	3
Renew Blue
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	$ 0	0	$ 3
Facility closure and other costs | Best Buy Mobile
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0		49
Restructuring Reserve	1		1		$ 0
Facility closure and other costs | Canadian brand consolidation
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	9		9
Facility closure and other costs | Renew Blue
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	9		9
Facility closure and other costs | U.S. large format store closures
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 2		$ 2