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Available-for-Sale Debt and Equity Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions | Jan. 29, 2022 | Jul. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | $ 7,360 | $ 2,910
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (141) | (15)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 290 | 19
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (13) | 0
TOTAL, Fair Value | 7,650 | 2,929
TOTAL, Gross Unrealized Losses | (154) | (15)
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 1,124 | 468
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (19) | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 2 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | 0 | 0
TOTAL, Fair Value | 1,126 | 468
TOTAL, Gross Unrealized Losses | (19) | 0
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 125 | 26
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (1) | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 15 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (1) | 0
TOTAL, Fair Value | 140 | 26
TOTAL, Gross Unrealized Losses | (2) | 0
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 4,230 | 1,086
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (69) | (5)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 182 | 6
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (8) | 0
TOTAL, Fair Value | 4,412 | 1,092
TOTAL, Gross Unrealized Losses | (77) | (5)
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 1,881 | 1,293
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (52) | (10)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 91 | 13
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (4) | 0
TOTAL, Fair Value | 1,972 | 1,306
TOTAL, Gross Unrealized Losses | $ (56) | (10)
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value |  | 37
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 |  | 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 http://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 http://asc.fasb.org/extlink&oid=123581744&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=123581744&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=124269663&loc=SL82922890-210455 + Details
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