Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 27, 2019	Jan. 28, 2018	Jan. 29, 2017	Nov. 15, 2018
Equity [Abstract]
Stock repurchased (in shares)	9,000,000
Payments for repurchase of stock	$ 1,580
Dividends paid	$ 371	$ 341	$ 261
Aggregate number of shares repurchased under stock repurchase program (in shares)	260,000,000
Aggregated cost of shares repurchased	$ 7,080
Additional shares authorized under share repurchase program				$ 7,000
Remaining authorized shares repurchase amount	$ 7,240
Preferred stock outstanding (in shares)	0	0
Common stock, shares authorized (in shares)	2,000,000,000.00	2,000,000,000
Common stock, par value (in USD per share)	$ 0.001	$ 0.001