Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 28, 2019	Jan. 27, 2019
Assets
Cash equivalents and marketable securities	$ 7,691	$ 7,324
2.20% Notes Due 2021
Liabilities
Stated interest rate (as percent)	2.20%
3.20% Notes Due 2026
Liabilities
Stated interest rate (as percent)	3.20%
Corporate debt securities
Assets
Cash equivalents and marketable securities	$ 2,899	2,620
Debt securities of United States government agencies
Assets
Cash equivalents and marketable securities	1,881	2,280
Debt securities issued by the United States Treasury
Assets
Cash equivalents and marketable securities	1,833	1,492
Money market funds
Assets
Cash equivalents and marketable securities	681	483
Foreign government bonds
Assets
Cash equivalents and marketable securities	183	209
Asset-backed securities
Assets
Cash equivalents and marketable securities	132	151
Mortgage-backed securities issued by United States government-sponsored enterprises
Assets
Cash equivalents and marketable securities	82	89
Fair Value, Inputs, Level 1 \| Money market funds
Assets
Cash equivalents and marketable securities	681	483
Fair Value, Inputs, Level 2 \| 2.20% Notes Due 2021
Liabilities
Notes	989	978
Fair Value, Inputs, Level 2 \| 3.20% Notes Due 2026
Liabilities
Notes	997	961
Fair Value, Inputs, Level 2 \| Corporate debt securities
Assets
Cash equivalents and marketable securities	2,899	2,620
Fair Value, Inputs, Level 2 \| Debt securities of United States government agencies
Assets
Cash equivalents and marketable securities	1,881	2,280
Fair Value, Inputs, Level 2 \| Debt securities issued by the United States Treasury
Assets
Cash equivalents and marketable securities	1,833	1,492
Fair Value, Inputs, Level 2 \| Foreign government bonds
Assets
Cash equivalents and marketable securities	183	209
Fair Value, Inputs, Level 2 \| Asset-backed securities
Assets
Cash equivalents and marketable securities	132	151
Fair Value, Inputs, Level 2 \| Mortgage-backed securities issued by United States government-sponsored enterprises
Assets
Cash equivalents and marketable securities	$ 82	$ 89

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
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-Section 50
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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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