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Available-for-Sale Debt and Equity Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions | Jul. 30, 2022 | Jul. 31, 2021
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Schedule of Investments [Line Items] |  |
Unrealized loss less than 12 months, Fair Value | $ 9,713 | $ 2,910
Unrealized loss less than 12 months, Gross Unrealized Losses | (382) | (15)
Unrealized losses 12 months or greater, Fair Value | 1,181 | 19
Unrealized losses 12 months or greater, Gross Unrealized Losses | (106) | 0
Total, Fair Value | 10,894 | 2,929
Total, Gross Unrealized Losses | (488) | (15)
U.S. government securities |  |
Schedule of Investments [Line Items] |  |
Unrealized loss less than 12 months, Fair Value | 1,110 | 468
Unrealized loss less than 12 months, Gross Unrealized Losses | (44) | 0
Unrealized losses 12 months or greater, Fair Value | 120 | 0
Unrealized losses 12 months or greater, Gross Unrealized Losses | (5) | 0
Total, Fair Value | 1,230 | 468
Total, Gross Unrealized Losses | (49) | 0
U.S. government agency securities |  |
Schedule of Investments [Line Items] |  |
Unrealized loss less than 12 months, Fair Value | 114 | 26
Unrealized loss less than 12 months, Gross Unrealized Losses | (2) | 0
Unrealized losses 12 months or greater, Fair Value | 24 | 0
Unrealized losses 12 months or greater, Gross Unrealized Losses | (2) | 0
Total, Fair Value | 138 | 26
Total, Gross Unrealized Losses | (4) | 0
Non-U.S. government and agency securities |  |
Schedule of Investments [Line Items] |  |
Unrealized loss less than 12 months, Fair Value | 264 |
Unrealized loss 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 | 264 |
Total, Gross Unrealized Losses | 0 |
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Unrealized loss less than 12 months, Fair Value | 6,920 | 1,086
Unrealized loss less than 12 months, Gross Unrealized Losses | (240) | (5)
Unrealized losses 12 months or greater, Fair Value | 422 | 6
Unrealized losses 12 months or greater, Gross Unrealized Losses | (37) | 0
Total, Fair Value | 7,342 | 1,092
Total, Gross Unrealized Losses | (277) | (5)
U.S. agency mortgage-backed securities |  |
Schedule of Investments [Line Items] |  |
Unrealized loss less than 12 months, Fair Value | 1,305 | 1,293
Unrealized loss less than 12 months, Gross Unrealized Losses | (96) | (10)
Unrealized losses 12 months or greater, Fair Value | 615 | 13
Unrealized losses 12 months or greater, Gross Unrealized Losses | (62) | 0
Total, Fair Value | 1,920 | 1,306
Total, Gross Unrealized Losses | $ (158) | (10)
Commercial paper |  |
Schedule of Investments [Line Items] |  |
Unrealized loss less than 12 months, Fair Value |  | 37
Unrealized loss 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 |  | 37
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 https://asc.fasb.org/extlink&oid=124269663&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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