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Available-for-Sale Debt Investments and Equity Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions | Jul. 27, 2019 | Jul. 28, 2018
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Unrealized loss less than 12 months, Fair Value | $ 2,689 | $ 21,093
Unrealized loss less than 12 months, Gross Unrealized Losses | (4) | (391)
Unrealized losses 12 months or greater, Fair Value | 6,775 | 9,019
Unrealized losses 12 months or greater, Gross Unrealized Losses | (37) | (156)
Total, Fair Value | 9,464 | 30,112
Total, Gross Unrealized Losses | (41) | (547)
U.S. government securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Unrealized loss less than 12 months, Fair Value | 204 | 2,966
Unrealized loss less than 12 months, Gross Unrealized Losses | 0 | (20)
Unrealized losses 12 months or greater, Fair Value | 488 | 4,303
Unrealized losses 12 months or greater, Gross Unrealized Losses | (1) | (23)
Total, Fair Value | 692 | 7,269
Total, Gross Unrealized Losses | (1) | (43)
U.S. government agency securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Unrealized loss less than 12 months, Fair Value | 0 | 206
Unrealized loss less than 12 months, Gross Unrealized Losses | 0 | (2)
Unrealized losses 12 months or greater, Fair Value | 169 | 521
Unrealized losses 12 months or greater, Gross Unrealized Losses | 0 | (3)
Total, Fair Value | 169 | 727
Total, Gross Unrealized Losses | 0 | (5)
Non-U.S. government and agency securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Unrealized loss less than 12 months, Fair Value |  | 105
Unrealized loss less than 12 months, Gross Unrealized Losses |  | (1)
Unrealized losses 12 months or greater, Fair Value |  | 103
Unrealized losses 12 months or greater, Gross Unrealized Losses |  | 0
Total, Fair Value |  | 208
Total, Gross Unrealized Losses |  | (1)
Corporate debt securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Unrealized loss less than 12 months, Fair Value | 2,362 | 16,990
Unrealized loss less than 12 months, Gross Unrealized Losses | (4) | (344)
Unrealized losses 12 months or greater, Fair Value | 5,271 | 3,511
Unrealized losses 12 months or greater, Gross Unrealized Losses | (25) | (101)
Total, Fair Value | 7,633 | 20,501
Total, Gross Unrealized Losses | (29) | (445)
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Unrealized loss less than 12 months, Fair Value | 123 | 826
Unrealized loss less than 12 months, Gross Unrealized Losses | 0 | (24)
Unrealized losses 12 months or greater, Fair Value | 847 | 581
Unrealized losses 12 months or greater, Gross Unrealized Losses | (11) | (29)
Total, Fair Value | 970 | 1,407
Total, Gross Unrealized Losses | $ (11) | $ (53)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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