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Fair Value - Fair Value On Nonrecurring Basis (Details) - Nonrecurring - Level 3 - USD ($) $ in Millions | 12 Months Ended
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Jul. 27, 2019 | Jul. 28, 2018 | Jul. 29, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total gains (losses) for nonrecurring measurements | $ (32) | $ (43) | $ (254)
Non-marketable equity securities and equity method investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total gains (losses) for nonrecurring measurements | (32) | (62) | (177)
Purchased intangible assets (impaired) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total gains (losses) for nonrecurring measurements | 0 | (1) | (47)
Property held for sale - land and buildings |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total gains (losses) for nonrecurring measurements | $ 0 | $ 20 | $ (30)

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