Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Feb. 26, 2016	Feb. 01, 2014
Class of Stock [Line Items]
Preferred stock, shares authorized	125,000,000
Preferred stock, par value	$ 0.01
Preferred stock, shares issued	0
Common stock, shares authorized	1,000,000,000
Common stock, par value	$ 0.01
Common stock, shares issued	333,605,800	341,605,800	379,605,800		410,605,800
Common stock, shares outstanding	304,062,800	310,256,100	340,573,700		364,935,000
Retirement of common stock	8,000,000	38,000,000	31,000,000
Stock Repurchase Program, Additional Authorized Amount				$ 1,500
Stock repurchase program authorized amount	$ 18,000
Stock repurchased during period, shares	7,900,000	34,800,000	31,900,000
Stock repurchased during period, value	$ 316	$ 2,000	$ 1,900
Stock repurchase program remaining authorized repurchase amount	$ 1,716