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Available-for-Sale Debt Investments and Equity Investments - Summary of Gains and Losses Recognized on Marketable and Non-marketable Equity Securities (Details)
$ in Millions
12 Months Ended
Jul. 27, 2019
USD ($)
Adjustments to non-marketable equity securities measured using the measurement alternative:  
Upward adjustments $ 35
Downward adjustments, including impairments (57)
Net adjustments (22)
Net gains and losses recognized during the period on equity investments 58
Less: Net gains and losses recognized on equity investments sold (69)
Net unrealized gains and losses recognized during reporting period on equity securities still held at the reporting date $ (11)