Stockholders' Equity (Common Stock) (Details) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2017	Feb. 01, 2020	Feb. 02, 2019	Feb. 03, 2018	Mar. 31, 2019	Mar. 31, 2018	Feb. 28, 2018
Stockholders' Equity Note [Abstract]
Stock repurchased program period	2 years
Stock repurchase program, approved amount	$ 1,750,000,000				$ 2,550,000,000
Stock repurchase program, authorized increase						$ 200,000,000
Stock repurchase program, remaining amount		$ 1,275,000,000				$ 1,075,000,000.000	$ 875,000,000
Shares repurchased (in shares)		12.3	12.5	13.5
Average repurchase price (in dollars per share)		$ 103.99	$ 86.19	$ 64.87
Common stock repurchased, value		$ 1,275,000,000	$ 1,075,000,000	$ 875,000,000