XML 92 R79.htm IDEA: XBRL DOCUMENT v3.10.0.1
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 6 Months Ended
Jan. 26, 2019
Jan. 26, 2019
Adjustments to non-marketable equity securities measured using the measurement alternative:    
Upward adjustments $ 14 $ 24
Downward adjustments, including impairments (2) (18)
Net upward adjustments 12 6
Net gains and losses recognized during the period on equity investments 67 75
Less: Net gains and losses recognized on equity investments sold 5 (7)
Unrealized gains and losses recognized during reporting period on equity securities still held at the reporting date $ 72 $ 68