Restructuring Charges - Canadian Brand Consolidation (Details) - Aug. 01, 2015 - Restructuring Program Canadian Brand Consolidation [Member] $ in Millions		USD ($) store
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		$ 0
Restructuring Charges, Rollforward		131
Cash payments		(39)
Adjustments	[1]	(6)
Restructuring Reserve, Translation Adjustment		(3)
Restructuring reserve, balance at the end of the period		83
Termination benefits [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at the beginning of the period		0
Restructuring Charges, Rollforward		27
Cash payments		(21)
Adjustments	[1]	(2)
Restructuring Reserve, Translation Adjustment		0
Restructuring reserve, balance at the end of the period		4
Facility closure and other costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at the beginning of the period		0
Restructuring Charges, Rollforward		104
Cash payments		(18)
Adjustments	[1]	(4)
Restructuring Reserve, Translation Adjustment		(3)
Restructuring reserve, balance at the end of the period		79
Continuing Operations [Member] | International Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		184
Continuing Operations [Member] | International Segment [Member] | Inventory write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		5
Continuing Operations [Member] | International Segment [Member] | Property and equipment impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		30
Continuing Operations [Member] | International Segment [Member] | Impairment of Intangible Assets Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		40
Continuing Operations [Member] | International Segment [Member] | Termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		24
Continuing Operations [Member] | International Segment [Member] | Facility closure and other costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		85
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		200
Expected Payments for Restructuring		140
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		280
Expected Payments for Restructuring		$ 180

[1] The adjustments related to termination benefits relate to higher-than-expected employee retention. Adjustments to facility closure and other costs represent changes in sublease assumptions.