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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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