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Investments (Tables)
 3 Months Ended
Oct. 26, 2024
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 26, 2024Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit
Losses		Fair
Value
U.S. government securities$2,390 $2 $(24)$2,368 
U.S. government agency securities 154 — (1)153 
Non-U.S. government and agency securities388 1 — 389 
Corporate debt securities3,610 9 (107)3,512 
U.S. agency mortgage-backed securities1,038 — (133)905 
Commercial paper1,193 — — 1,193 
Certificates of deposit674 — — 674 
Total$9,447 $12 $(265)$9,194 
July 27, 2024Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit
Losses		Fair
Value
U.S. government securities$2,380 $1 $(28)$2,353 
U.S. government agency securities 223 — (2)221 
Non-U.S. government and agency securities370 1 — 371 
Corporate debt securities3,818 5 (146)3,677 
U.S. agency mortgage-backed securities1,959 — (178)1,781 
Commercial paper1,023 — — 1,023 
Certificates of deposit439 — — 439 
Total$10,212 $7 $(354)$9,865 
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 26, 2024October 28, 2023
Gross realized gains$8 $— 
Gross realized losses(33)(20)
Total$(25)$(20)
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 26, 2024 and July 27, 2024 (in millions):
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
October 26, 2024Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities$1,134 $(11)$634 $(13)$1,768 $(24)
U.S. government agency securities37 — 60 (1)97 (1)
Non-U.S. government and agency securities26 — — — 26 — 
Corporate debt securities221 (1)2,402 (76)2,623 (77)
U.S. agency mortgage-backed securities7 — 896 (133)903 (133)
Commercial paper10 — — — 10 — 
Total$1,435 $(12)$3,992 $(223)$5,427 $(235)
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
July 27, 2024Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities$598 $(2)$1,399 $(26)$1,997 $(28)
U.S. government agency securities89 — 109 (2)198 (2)
Non-U.S. government and agency securities17 — — — 17 — 
Corporate debt securities276 (1)2,818 (115)3,094 (116)
U.S. agency mortgage-backed securities238 (1)1,438 (177)1,676 (178)
Commercial paper10 — — — 10 — 
Total$1,228 $(4)$5,764 $(320)$6,992 $(324)
Maturities of Available-for-Sale Debt Investments
The following table summarizes the maturities of our available-for-sale debt investments as of October 26, 2024 (in millions): 
Amortized CostFair Value
Within 1 year$4,045 $4,012 
After 1 year through 5 years4,364 4,277 
Mortgage-backed securities with no single maturity1,038 905 
Total$9,447 $9,194