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Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions | Oct. 26, 2024 | Jul. 27, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | $ 1,435 | $ 1,228
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (12) | (4)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 3,992 | 5,764
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (223) | (320)
TOTAL, Fair Value | 5,427 | 6,992
TOTAL, Gross Unrealized Losses | (235) | (324)
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 1,134 | 598
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (11) | (2)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 634 | 1,399
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (13) | (26)
TOTAL, Fair Value | 1,768 | 1,997
TOTAL, Gross Unrealized Losses | (24) | (28)
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 37 | 89
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 60 | 109
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (1) | (2)
TOTAL, Fair Value | 97 | 198
TOTAL, Gross Unrealized Losses | (1) | (2)
Non-U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 26 | 17
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 | 26 | 17
TOTAL, Gross Unrealized Losses | 0 | 0
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 221 | 276
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (1) | (1)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 2,402 | 2,818
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (76) | (115)
TOTAL, Fair Value | 2,623 | 3,094
TOTAL, Gross Unrealized Losses | (77) | (116)
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 7 | 238
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | (1)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 896 | 1,438
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (133) | (177)
TOTAL, Fair Value | 903 | 1,676
TOTAL, Gross Unrealized Losses | (133) | (178)
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 10 | 10
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 | 10 | 10
TOTAL, Gross Unrealized Losses | $ 0 | $ 0

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