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Investments (Tables)
 12 Months Ended
Jul. 29, 2023
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Investments
The following tables summarize our available-for-sale debt investments (in millions):
July 29, 2023Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit Losses		Fair
Value
U.S. government securities
$3,587 $1 $(62)$3,526 
U.S. government agency securities 428 — (5)423 
Non-U.S. government and agency securities364 — (1)363 
Corporate debt securities7,238 3 (327)6,914 
U.S. agency mortgage-backed securities2,421 14 (230)2,205 
Commercial paper1,484 — — 1,484 
Certificates of deposit677 — — 677 
Total$16,199 $18 $(625)$15,592 
July 30, 2022Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit Losses		Fair
Value
U.S. government securities
$1,287 $— $(49)$1,238 
U.S. government agency securities 142 — (4)138 
Non-U.S. government and agency securities272 — — 272 
Corporate debt securities8,127 2 (311)7,818 
U.S. agency mortgage-backed securities2,134 — (158)1,976 
Commercial paper255 — — 255 
Certificates of deposit250 — — 250 
Total$12,467 $2 $(522)$11,947 
Gross Realized Gains and Gross Realized Losses Related to Available-for-Sale Investment
The following table presents the gross realized gains and gross realized losses related to available-for-sale debt investments (in millions):
Years EndedJuly 29, 2023July 30, 2022July 31, 2021
Gross realized gains$4 $27 $55 
Gross realized losses(25)(18)(2)
Total$(21)$9 $53 
Available-for-Sale Investments with Gross Unrealized Losses
The following tables present the breakdown of the available-for-sale debt investments with gross unrealized losses and the duration that those losses had been unrealized at July 29, 2023 and July 30, 2022 (in millions):
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
July 29, 2023Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities$2,394 $(26)$931 $(36)$3,325 $(62)
U.S. government agency securities343 (2)72 (3)415 (5)
Non-U.S. government and agency securities363 (1)— — 363 (1)
Corporate debt securities1,736 (22)4,315 (275)6,051 (297)
U.S. agency mortgage-backed securities658 (13)1,438 (217)2,096 (230)
Commercial paper97 — — — 97 — 
Certificates of deposit2 — — — 2 — 
Total$5,593 $(64)$6,756 $(531)$12,349 $(595)
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
July 30, 2022Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities$1,110 $(44)$120 $(5)$1,230 $(49)
U.S. government agency securities114 (2)24 (2)138 (4)
Non-U.S. government and agency securities264 — — — 264 — 
Corporate debt securities6,920 (240)422 (37)7,342 (277)
U.S. agency mortgage-backed securities1,305 (96)615 (62)1,920 (158)
Total$9,713 $(382)$1,181 $(106)$10,894 $(488)
Maturities of Fixed Income Securities
The following table summarizes the maturities of our available-for-sale debt investments as of July 29, 2023 (in millions): 
Amortized CostFair Value
Within 1 year$5,510 $5,462 
After 1 year through 5 years8,197 7,856 
After 5 years through 10 years69 67 
After 10 years2 2 
Mortgage-backed securities with no single maturity2,421 2,205 
Total$16,199 $15,592