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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) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 25, 2020
Apr. 27, 2019
Apr. 25, 2020
Apr. 27, 2019
Investments, Debt and Equity Securities [Abstract]        
Net gains and losses recognized during the period on equity investments $ (7) $ 3 $ 71 $ 78
Less: Net gains and losses recognized on equity investments sold 3 (44) (71) (51)
Net unrealized gains and losses recognized during reporting period on equity securities still held at the reporting date (4) (41) 0 27
Adjustments to non-marketable equity securities measured using the measurement alternative:        
Upward adjustments 9 9 20 25
Downward adjustments, including impairments (13) (4) (21) (22)
Net adjustments $ (4) $ 5 $ (1) $ 3