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Available-for-Sale Debt and Equity Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions | Jan. 23, 2021 | Jul. 25, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | $ 1,521 | $ 1,358
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (4) | (7)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 0 | 3
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | 0 | 0
TOTAL, Fair Value | 1,521 | 1,361
TOTAL, Gross Unrealized Losses | (4) | (7)
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 109 |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 |
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 0 |
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | 0 |
TOTAL, Fair Value | 109 |
TOTAL, Gross Unrealized Losses | 0 |
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 36 | 33
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 0 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | 0 | 0
TOTAL, Fair Value | 36 | 33
TOTAL, Gross Unrealized Losses | 0 | 0
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 663 | 1,060
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (1) | (6)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 0 | 3
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | 0 | 0
TOTAL, Fair Value | 663 | 1,063
TOTAL, Gross Unrealized Losses | (1) | (6)
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 698 | 265
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (3) | (1)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 0 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | 0 | 0
TOTAL, Fair Value | 698 | 265
TOTAL, Gross Unrealized Losses | (3) | $ (1)
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 15 |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 |
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 0 |
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | 0 |
TOTAL, Fair Value | 15 |
TOTAL, Gross Unrealized Losses | $ 0 |

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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=121582814&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=121645371&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=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, 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 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: 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=121582814&loc=SL82922890-210455 + Details
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