Cash Equivalents and Marketable Securities - Summary of Securities (Details) - USD ($) $ in Millions	Apr. 26, 2020	Jan. 26, 2020
Summary of cash equivalents and marketable securities:
Amortized Cost	$ 16,199	$ 10,781
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	16,199	10,781
Reported as
Cash Equivalents	15,339	10,780
Marketable Securities	860	1
Money market funds
Summary of cash equivalents and marketable securities:
Amortized Cost	11,128	7,507
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	11,128	7,507
Reported as
Cash Equivalents	11,128	7,507
Marketable Securities	0	0
Corporate debt securities
Summary of cash equivalents and marketable securities:
Amortized Cost	3,238	592
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	3,238	592
Reported as
Cash Equivalents	2,951	592
Marketable Securities	287	0
Foreign government bonds
Summary of cash equivalents and marketable securities:
Amortized Cost	870	200
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	870	200
Reported as
Cash Equivalents	870	200
Marketable Securities	0	0
Certificates of deposit
Summary of cash equivalents and marketable securities:
Amortized Cost	582	27
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	582	27
Reported as
Cash Equivalents	222	27
Marketable Securities	360
Debt securities issued by United States government agencies
Summary of cash equivalents and marketable securities:
Amortized Cost	381	1,096
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	381	1,096
Reported as
Cash Equivalents	168	1,096
Marketable Securities	$ 213	0
Debt securities issued by the United States Treasury
Summary of cash equivalents and marketable securities:
Amortized Cost		1,358
Unrealized Gain		0
Unrealized Loss		0
Estimated Fair Value		1,358
Reported as
Cash Equivalents		1,358
Marketable Securities		0
Asset-backed securities
Summary of cash equivalents and marketable securities:
Amortized Cost		1
Unrealized Gain		0
Unrealized Loss		0
Estimated Fair Value		1
Reported as
Cash Equivalents		0
Marketable Securities		$ 1

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of investment in marketable security.

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