Segment and Geographic Information Segment Information (Details) $ in Millions		3 Months Ended																12 Months Ended
		Feb. 02, 2019 USD ($)		Nov. 03, 2018 USD ($)	[1]	Aug. 04, 2018 USD ($)	[1]	May 05, 2018 USD ($)	[1]	Feb. 03, 2018 USD ($)		Oct. 28, 2017 USD ($)	[2]	Jul. 29, 2017 USD ($)	[2]	Apr. 29, 2017 USD ($)	[2]	Feb. 02, 2019 USD ($) segments		Feb. 03, 2018 USD ($)		Jan. 28, 2017 USD ($)
Business segment information
Number of reportable segments | segments																		2
Revenue																		$ 42,879		$ 42,151		$ 39,403
Operating income		$ 978	[1]	$ 322		$ 335		$ 265		$ 872	[2]	$ 350		$ 321		$ 300		1,900	[1]	1,843	[2]	1,854
Other income (expense):
Gain on sale of investments																		12		1		3
Investment income and other																		49		48		31
Interest expense																		(73)		(75)		(72)
Earnings from continuing operations before income tax expense																		1,888		1,817		1,816
Total assets		12,901								13,049								12,901		13,049		13,856
Total capital expenditures																		819		688		580
Total depreciation																		747		683		654
Domestic
Business segment information
Revenue																		39,304		38,662		36,248
Operating income	[3]																	1,797		1,752		1,764
Other income (expense):
Total assets		11,908								11,553								11,908		11,553		12,496
Total capital expenditures																		770		606		524
Total depreciation																		687		631		613
Domestic | Computing and Mobile Phones
Business segment information
Revenue	[4]																	17,439		17,386		16,397
Domestic | Consumer Electronics
Business segment information
Revenue	[4]																	12,959		12,841		12,228
Domestic | Appliances
Business segment information
Revenue	[4]																	4,020		3,717		3,253
Domestic | Entertainment
Business segment information
Revenue	[4]																	2,952		2,905		2,570
Domestic | Services
Business segment information
Revenue	[4]																	1,783		1,674		1,649
Domestic | Other
Business segment information
Revenue	[4]																	151		139		151
International
Business segment information
Revenue																		3,575		3,489		3,155
Operating income																		103		91		90
Other income (expense):
Total assets		$ 993								$ 1,496								993		1,496		1,360
Total capital expenditures																		49		82		56
Total depreciation																		60		52		41
International | Computing and Mobile Phones
Business segment information
Revenue	[4]																	1,625		1,612		1,515
International | Consumer Electronics
Business segment information
Revenue	[4]																	1,103		1,102		974
International | Appliances
Business segment information
Revenue	[4]																	324		273		184
International | Entertainment
Business segment information
Revenue	[4]																	258		254		221
International | Services
Business segment information
Revenue	[4]																	184		174		207
International | Other
Business segment information
Revenue	[4]																	$ 81		$ 74		$ 54

[1] (2)Includes $30 million, $17 million, $0 million and $(1) million of restructuring charges (benefit) recorded in the fiscal first, second, third and fourth quarters of 2019, respectively, and $46 million for the fiscal year ended February 2, 2019, related to measures we took to restructure our businesses. Also includes $13 million of acquisition-related transaction costs in the fiscal third quarter of 2019 and $5 million and $17 million of non-cash amortization of definite-lived intangible assets in the fiscal third and fourth quarters of 2019, respectively, associated with the acquisition of GreatCall. Total non-cash amortization of definite-lived intangible assets for the fiscal year ended February 2, 2019 was $22 million. The fiscal first quarter and year ended February 2, 2019, also includes $7 million related to the one-time bonus for certain employees in response to future tax savings created by the Tax Act.

[2] (5)Includes $0 million, $2 million, $(2) million and $10 million of restructuring charges (benefit) recorded in the fiscal first, second, third and fourth quarters of 2018, respectively, and $10 million for the fiscal year ended February 3, 2018, related to measures we took to restructure our businesses. Also includes $80 million related to a one-time bonus for certain employees and $20 million related to a one-time contribution to the Best Buy Foundation in response to future tax savings created by the Tax Act for the fiscal fourth quarter and year ended February 3, 2018.

[3] (2)The Domestic segment operating income includes certain operations that are based in foreign tax jurisdictions and primarily relate to sourcing products into the U.S.

[4] (1)Refer to Item 1, Business, of this Annual Report on Form 10-K for additional information regarding the key components of each revenue category. GreatCall results of operations from the date of acquisition were included within the Domestic segment and Services revenue category