Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Millions		Jul. 29, 2018	Jan. 28, 2018
Assets
Cash equivalents and marketable securities		$ 7,708	$ 6,895
Corporate debt securities
Assets
Cash equivalents and marketable securities		2,484	1,295
Debt securities issued by the United States Treasury
Assets
Cash equivalents and marketable securities		2,410	573
Debt securities of United States government agencies
Assets
Cash equivalents and marketable securities		1,987	815
Money market funds
Assets
Cash equivalents and marketable securities		483	3,789
Asset-backed securities
Assets
Cash equivalents and marketable securities		204	252
Mortgage-backed securities issued by United States government-sponsored enterprises
Assets
Cash equivalents and marketable securities		108	130
Foreign government bonds
Assets
Cash equivalents and marketable securities		32	41
Fair Value, Inputs, Level 1 | Money market funds
Assets
Cash equivalents and marketable securities		483	3,789
Fair Value, Inputs, Level 2
Liabilities
1.00% Convertible Senior Notes	[1]	175	189
Fair Value, Inputs, Level 2 | 2.20% Notes Due 2021
Liabilities
Notes	[1]	970	982
Fair Value, Inputs, Level 2 | 3.20% Notes Due 2026
Liabilities
Notes	[1]	970	986
Fair Value, Inputs, Level 2 | Corporate debt securities
Assets
Cash equivalents and marketable securities		2,484	1,295
Fair Value, Inputs, Level 2 | Debt securities issued by the United States Treasury
Assets
Cash equivalents and marketable securities		2,410	573
Fair Value, Inputs, Level 2 | Debt securities of United States government agencies
Assets
Cash equivalents and marketable securities		1,987	815
Fair Value, Inputs, Level 2 | Asset-backed securities
Assets
Cash equivalents and marketable securities		204	252
Fair Value, Inputs, Level 2 | Mortgage-backed securities issued by United States government-sponsored enterprises
Assets
Cash equivalents and marketable securities		108	130
Fair Value, Inputs, Level 2 | Foreign government bonds
Assets
Cash equivalents and marketable securities		$ 32	$ 41

[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.