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Investments (Tables)
 3 Months Ended
Oct. 28, 2023
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Debt Investments
The following tables summarize our available-for-sale debt investments (in millions):

October 28, 2023Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit
Losses		Fair
Value
U.S. government securities$2,596 $— $(72)$2,524 
U.S. government agency securities 421 — (6)415 
Non-U.S. government and agency securities351 — — 351 
Corporate debt securities6,862 1 (363)6,500 
U.S. agency mortgage-backed securities2,431 — (318)2,113 
Commercial paper943 — — 943 
Certificates of deposit666 — — 666 
Total$14,270 $1 $(759)$13,512 
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)$15,592 
Gross Realized Gains and Gross Realized Losses Related to Available-for-Sale Investment
The following table presents the gross realized gains and gross realized losses related to available-for-sale debt investments (in millions):
Three Months Ended
October 28, 2023October 29, 2022
Gross realized gains$— $— 
Gross realized losses(20)(6)
Total$(20)$(6)
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 October 28, 2023 and July 29, 2023 (in millions):
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
October 28, 2023Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities$1,844 $(38)$680 $(34)$2,524 $(72)
U.S. government agency securities377 (3)38 (3)415 (6)
Non-U.S. government and agency securities324 — — — 324 — 
Corporate debt securities1,679 (29)4,275 (304)5,954 (333)
U.S. agency mortgage-backed securities798 (45)1,315 (273)2,113 (318)
Commercial paper10 — — — 10 — 
Certificates of deposit10 — — — 10 — 
Total$5,042 $(115)$6,308 $(614)$11,350 $(729)
 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)
Maturities of Available-for-Sale Debt Investments
The following table summarizes the maturities of our available-for-sale debt investments as of October 28, 2023 (in millions): 
Amortized CostFair Value
Within 1 year$4,201 $4,152 
After 1 year through 5 years7,627 7,236 
After 5 years through 10 years9 9 
After 10 years2 2 
Mortgage-backed securities with no single maturity2,431 2,113 
Total$14,270 $13,512