Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jul. 29, 2018	Jul. 29, 2018	Jul. 30, 2017	Jan. 28, 2018
Notes to financial statements [Abstract]
Shares repurchased during period (in shares)		3,000,000
Shares repurchased during period		$ 655
Dividends paid	$ 91	$ 182	$ 166
Aggregated number of shares repurchased under stock repurchase program (in shares)	254,000,000	254,000,000
Aggregated cost of shares repurchased	$ 6,160	$ 6,160
Remaining authorized repurchase amount	$ 1,160	$ 1,160
Preferred stock outstanding (in shares)	0	0		0
Authorized number of shares of common stock (in shares)	2,000,000,000.00	2,000,000,000.00
Par value of common stock (in dollars per share)	$ 0.001	$ 0.001