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Available-for-Sale Debt and Equity Investments (Tables)
 3 Months Ended
Oct. 29, 2022
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 29, 2022Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit
Losses		Fair
Value
U.S. government securities$1,545 $— $(70)$1,475 
U.S. government agency securities 171 — (6)165 
Non-U.S. government and agency securities275 — (1)274 
Corporate debt securities7,808 — (492)7,316 
U.S. agency mortgage-backed securities2,071 — (273)1,798 
Commercial paper798 — — 798 
Certificates of deposit421 — — 421 
Total$13,089 $— $(842)$12,247 
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)$11,947 
Gross Realized Gains and Gross Realized Losses Related to Available-for-Sale Investment
The following table presents the gross realized gains and gross realized losses related to available-for-sale debt investments (in millions):
Three Months Ended
October 29, 2022October 30, 2021
Gross realized gains$— $6 
Gross realized losses(6)— 
Total$(6)$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 29, 2022 and July 30, 2022 (in millions):
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
October 29, 2022Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities$530 $(12)$944 $(58)$1,474 $(70)
U.S. government agency securities101 (2)64 (4)165 (6)
Non-U.S. government and agency securities257 (1)— — 257 (1)
Corporate debt securities5,065 (252)2,090 (206)7,155 (458)
U.S. agency mortgage-backed securities651 (76)1,136 (197)1,787 (273)
Commercial paper45 — — — 45 — 
Total$6,649 $(343)$4,234 $(465)$10,883 $(808)
 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 Available-for-Sale Debt Investments
The following table summarizes the maturities of our available-for-sale debt investments as of October 29, 2022 (in millions): 
Amortized CostFair Value
Within 1 year$4,483 $4,399 
After 1 year through 5 years6,478 6,002 
After 5 years through 10 years56 47 
After 10 years1 1 
Mortgage-backed securities with no single maturity2,071 1,798 
Total$13,089 $12,247