Cash, Cash Equivalents, and Restricted Cash (Restricted Cash) (Details) - USD ($) $ in Millions	Jul. 31, 2020	Jan. 31, 2020	Aug. 02, 2019	[1]	Feb. 01, 2019	[1]
Investments, Debt and Equity Securities [Abstract]
Cash and cash equivalents	$ 4,703	$ 2,915
Restricted cash within other current assets	85	83
Restricted cash within other assets	34	33
Total cash, cash equivalents and restricted cash	$ 4,822	$ 3,031	$ 3,856		$ 3,596

[1] Adjusted to reflect the recast of prior period information due to the Pivotal Software, Inc. (“Pivotal”) acquisition in fiscal 2020, which was accounted for as a transaction between entities under common control (refer to Note A).