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Available-for-Sale Debt Investments and Equity Investments - Summary of Available-for-Sale Investments (Details) - USD ($) $ in Millions | Jul. 27, 2019 | Jul. 28, 2018
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Summary of Available-for-Sale Debt Securities [Abstract] |  |
Amortized Cost | $ 21,590 | $ 37,512
Gross Unrealized Gains | 111 | 44
Gross Unrealized Losses | (41) | (547)
Available-for-sale debt investments | 21,660 | 37,009
Net unsettled, available-for-sale investments purchases (sales), net |  | 1,500
U.S. government securities |  |
Summary of Available-for-Sale Debt Securities [Abstract] |  |
Amortized Cost | 808 | 7,318
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (1) | (43)
Available-for-sale debt investments | 808 | 7,275
U.S. government agency securities |  |
Summary of Available-for-Sale Debt Securities [Abstract] |  |
Amortized Cost | 169 | 732
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (5)
Available-for-sale debt investments | 169 | 727
Non-U.S. government and agency securities |  |
Summary of Available-for-Sale Debt Securities [Abstract] |  |
Amortized Cost |  | 209
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Available-for-sale debt investments |  | 208
Corporate debt securities |  |
Summary of Available-for-Sale Debt Securities [Abstract] |  |
Amortized Cost | 19,188 | 27,765
Gross Unrealized Gains | 103 | 44
Gross Unrealized Losses | (29) | (445)
Available-for-sale debt investments | 19,262 | 27,364
U.S. agency mortgage-backed securities |  |
Summary of Available-for-Sale Debt Securities [Abstract] |  |
Amortized Cost | 1,425 | 1,488
Gross Unrealized Gains | 7 | 0
Gross Unrealized Losses | (11) | (53)
Available-for-sale debt investments | $ 1,421 | $ 1,435

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