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Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions | Apr. 26, 2025 | Jul. 27, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | $ 1,381 | $ 1,228
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (7) | (4)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 2,743 | 5,764
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (123) | (320)
TOTAL, Fair Value | 4,124 | 6,992
TOTAL, Gross Unrealized Losses | (130) | (324)
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 970 | 598
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (6) | (2)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 313 | 1,399
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (9) | (26)
TOTAL, Fair Value | 1,283 | 1,997
TOTAL, Gross Unrealized Losses | (15) | (28)
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 10 | 89
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 31 | 109
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | 0 | (2)
TOTAL, Fair Value | 41 | 198
TOTAL, Gross Unrealized Losses | 0 | (2)
Non-U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 76 | 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 | 76 | 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 | 319 | 276
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (1) | (1)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 1,917 | 2,818
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (48) | (115)
TOTAL, Fair Value | 2,236 | 3,094
TOTAL, Gross Unrealized Losses | (49) | (116)
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 6 | 238
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | (1)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 482 | 1,438
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (66) | (177)
TOTAL, Fair Value | 488 | 1,676
TOTAL, Gross Unrealized Losses | $ (66) | (178)
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value |  | 10
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 |  | 10
TOTAL, Gross Unrealized Losses |  | $ 0

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