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Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions | Jan. 27, 2024 | Jul. 29, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | $ 2,551 | $ 5,593
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (17) | (64)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 5,436 | 6,756
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (396) | (531)
TOTAL, Fair Value | 7,987 | 12,349
TOTAL, Gross Unrealized Losses | (413) | (595)
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 1,145 | 2,394
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (9) | (26)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 550 | 931
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (25) | (36)
TOTAL, Fair Value | 1,695 | 3,325
TOTAL, Gross Unrealized Losses | (34) | (62)
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 224 | 343
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | (2)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 39 | 72
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (2) | (3)
TOTAL, Fair Value | 263 | 415
TOTAL, Gross Unrealized Losses | (2) | (5)
Non-U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 200 | 363
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | 0 | (1)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 0 | 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | 0 | 0
TOTAL, Fair Value | 200 | 363
TOTAL, Gross Unrealized Losses | 0 | (1)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 557 | 1,736
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (2) | (22)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 3,527 | 4,315
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (178) | (275)
TOTAL, Fair Value | 4,084 | 6,051
TOTAL, Gross Unrealized Losses | (180) | (297)
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 415 | 658
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses | (6) | (13)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value | 1,320 | 1,438
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses | (191) | (217)
TOTAL, Fair Value | 1,735 | 2,096
TOTAL, Gross Unrealized Losses | (197) | (230)
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value | 10 | 97
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 | 97
TOTAL, Gross Unrealized Losses | $ 0 | 0
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value |  | 2
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 |  | 2
TOTAL, Gross Unrealized Losses |  | $ 0

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