Summary of Significant Accounting Policies - Narrative (Details) $ in Millions		3 Months Ended	12 Months Ended
	Feb. 02, 2019 USD ($)	Feb. 01, 2019 USD ($)	Jan. 31, 2020 USD ($) store option	Feb. 01, 2019 USD ($)	Feb. 02, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from sales of available-for-sale securities			$ 121	$ 506	$ 523
Restricted balances included in short-term investments		$ 218	160	218
Restricted balances included in long-term investments		$ 256	$ 372	$ 256
Percentage of inventory valued using methods other than FIFO		7.00%	6.00%	7.00%
Accounts receivable sold			$ 3,200	$ 3,100	3,100
Loss on receivable sales			41	41	39
Goodwill impairment loss		$ 952	0	952	0
Payables placed on tracking system		2,100	1,900	2,100
Payables financed by participating suppliers		1,500	1,300	1,500
Total self insurance liability		953	1,100	953
Outstanding surety bonds relating to self-insurance		246	262	246
Advertising expenses			871	963	968
Foreign currency translation gain (loss), net of tax		$ (209)	$ (115)	$ (209)	$ 11
Long-lived assets held outside of the U.S. as a percentage of total long-lived assets		9.10%	7.70%	9.10%	9.80%
Net sales outside of the U.S. as a percentage of total sales			6.90%	7.60%	7.80%
Operating lease right-of-use assets			$ 3,891
Operating lease liability			4,444
Deferred tax impact			139	$ (157)	$ 56
Adjustment to retained earnings		$ (3,452)	(1,727)	(3,452)
Payables placed and settled on tracking system			$ 8,700	$ 8,400
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maturity date of long-term investments			1 year
Extended product warranty term			1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maturity date of long-term investments			3 years
Extended product warranty term			5 years
United States and Canada
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of stores | store			1,977
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 3,600
Operating lease liability	3,900
Deferred tax impact	87
Adjustment to retained earnings	$ 263
Facility
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease renewal term			5 years
Finance lease renewal term			5 years
Facility | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease term			5 years
Number of options to renew operating lease | option			4
Finance lease term			5 years
Number of options to renew finance lease | option			4
Facility | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease term			20 years
Number of options to renew operating lease | option			6
Finance lease term			20 years
Number of options to renew finance lease | option			6
Equipment | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease term			1 year
Finance lease term			1 year
Equipment | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease term			7 years
Finance lease term			7 years