Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Oct. 29, 2017	Oct. 29, 2017	Oct. 30, 2016
Notes to financial statements [Abstract]
Stock Repurchased During Period, Shares	1	6
Stock Repurchased During Period, Value	$ 151	$ 909
Payments of Dividends	$ 84	$ 250	$ 185
Aggregated number of shares repurchased under stock repurchase program	251	251
Aggregated cost of shares repurchased	$ 5,500	$ 5,500
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,820	$ 1,820
Authorized number of shares of common stock	2,000	2,000
Par value of common stock	$ 0.001	$ 0.001