Restructuring Charges Restructuring Accrual Activity (Details) $ in Millions		3 Months Ended	6 Months Ended
		May 02, 2015 store	Jul. 29, 2017 USD ($)	Jul. 30, 2016 USD ($)
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				(15)
Adjustments	[1]			(2)
Restructuring reserve, balance at the end of the period				2
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			0	1
Cash payments			(10)	(19)
Adjustments	[2]		(1)	(1)
Changes in foreign currency exchange rates			1	4
Restructuring reserve, balance at the end of the period			24	51
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	0
Cash payments			0	(1)
Adjustments			0	0
Changes in foreign currency exchange rates			0	0
Restructuring reserve, balance at the end of the period			0	1
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			0	1
Cash payments			(10)	(18)
Adjustments	[2]		(1)	(1)
Changes in foreign currency exchange rates			1	4
Restructuring reserve, balance at the end of the period			$ 24	$ 50

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

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