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Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions | Oct. 25, 2025 | Jul. 26, 2025
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Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | $ 82 | $ 1,517
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | (6)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 2,179 | 2,402
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (38) | (75)
TOTAL, Fair Value | 2,261 | 3,919
TOTAL, Gross Unrealized Losses | (38) | (81)
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 0 | 1,076
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | (6)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 436 | 302
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (4) | (6)
TOTAL, Fair Value | 436 | 1,378
TOTAL, Gross Unrealized Losses | (4) | (12)
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 5 | 8
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 0 | 21
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | 0 | 0
TOTAL, Fair Value | 5 | 29
TOTAL, Gross Unrealized Losses | 0 | 0
Non-U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value |  | 292
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 |  | 292
TOTAL, Gross Unrealized Losses |  | 0
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 63 | 106
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 1,583 | 1,800
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (18) | (35)
TOTAL, Fair Value | 1,646 | 1,906
TOTAL, Gross Unrealized Losses | (18) | (35)
Mortgage- and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 4 | 5
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 160 | 279
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (16) | (34)
TOTAL, Fair Value | 164 | 284
TOTAL, Gross Unrealized Losses | (16) | (34)
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 10 | 30
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 | 30
TOTAL, Gross Unrealized Losses | $ 0 | $ 0

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