Restructuring Charges Restructuring Accrual Activity (Details) $ in Millions		3 Months Ended	9 Months Ended
		May 02, 2015 store	Oct. 28, 2017 USD ($)	Oct. 29, 2016 USD ($)
Restructuring Program Renew Blue Phase 2 [Member] | Termination benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at the beginning of the period				$ 0
Charges				19
Cash payments				(16)
Adjustments	[1]			(2)
Restructuring reserve, balance at the end of the period				1
Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Number of stores to be closed | store		66
Number of Future Shop stores converted to Best Buy stores | store		65
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at the beginning of the period			$ 34	66
Charges				1
Cash payments			(14)	(31)
Adjustments	[2]		(3)	(2)
Changes in foreign currency exchange rates			1	3
Restructuring reserve, balance at the end of the period			18	37
Restructuring Program Canadian Brand Consolidation [Member] | Termination benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at the beginning of the period			0	2
Charges				0
Cash payments			0	(2)
Adjustments			0	0
Changes in foreign currency exchange rates			0	0
Restructuring reserve, balance at the end of the period			0	0
Restructuring Program Canadian Brand Consolidation [Member] | Facility closure and other costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at the beginning of the period			34	64
Charges				1
Cash payments			(14)	(29)
Adjustments	[2]		(3)	(2)
Changes in foreign currency exchange rates			1	3
Restructuring reserve, balance at the end of the period			$ 18	$ 37

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

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