Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Millions		Oct. 28, 2018	Jan. 28, 2018
Assets
Cash equivalents and marketable securities		$ 7,472	$ 6,895
Corporate debt securities
Assets
Cash equivalents and marketable securities		2,727	1,295
Debt securities of United States government agencies
Assets
Cash equivalents and marketable securities		2,135	815
Debt securities issued by the United States Treasury
Assets
Cash equivalents and marketable securities		1,542	573
Money market funds
Assets
Cash equivalents and marketable securities		602	3,789
Foreign government bonds
Assets
Cash equivalents and marketable securities		191	41
Asset-backed securities
Assets
Cash equivalents and marketable securities		176	252
Mortgage-backed securities issued by United States government-sponsored enterprises
Assets
Cash equivalents and marketable securities		99	130
Fair Value, Inputs, Level 1 | Money market funds
Assets
Cash equivalents and marketable securities		602	3,789
Fair Value, Inputs, Level 2
Liabilities
1.00% Convertible Senior Notes	[1]	43	189
Fair Value, Inputs, Level 2 | 2.20% Notes Due 2021
Liabilities
Notes	[1]	971	982
Fair Value, Inputs, Level 2 | 3.20% Notes Due 2026
Liabilities
Notes	[1]	943	986
Fair Value, Inputs, Level 2 | Corporate debt securities
Assets
Cash equivalents and marketable securities		2,727	1,295
Fair Value, Inputs, Level 2 | Debt securities of United States government agencies
Assets
Cash equivalents and marketable securities		2,135	815
Fair Value, Inputs, Level 2 | Debt securities issued by the United States Treasury
Assets
Cash equivalents and marketable securities		1,542	573
Fair Value, Inputs, Level 2 | Foreign government bonds
Assets
Cash equivalents and marketable securities		191	41
Fair Value, Inputs, Level 2 | Asset-backed securities
Assets
Cash equivalents and marketable securities		176	252
Fair Value, Inputs, Level 2 | Mortgage-backed securities issued by United States government-sponsored enterprises
Assets
Cash equivalents and marketable securities		$ 99	$ 130

[1] These liabilities are carried on our Consolidated Balance Sheets at their original issuance value, net of unamortized debt discount and issuance costs, and are not marked to fair value each period. Refer to Note 12 of these Notes to Condensed Consolidated Financial Statements for additional information.