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Available-for-Sale Debt and Equity Investments (Tables)
 9 Months Ended
Apr. 29, 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):

April 29, 2023Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit
Losses		Fair
Value
U.S. government securities$2,833 $9 $(42)$2,800 
U.S. government agency securities 365 1 (4)362 
Non-U.S. government and agency securities352 — — 352 
Corporate debt securities7,587 8 (305)7,290 
U.S. agency mortgage-backed securities2,221 1 (208)2,014 
Commercial paper1,595 — — 1,595 
Certificates of deposit485 — — 485 
Total$15,438 $19 $(559)$14,898 
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 EndedNine Months Ended
April 29, 2023April 30, 2022April 29, 2023April 30, 2022
Gross realized gains$1 $8 $4 $27 
Gross realized losses(7)(6)(19)(9)
Total$(6)$2 $(15)$18 
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 April 29, 2023 and July 30, 2022 (in millions):
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
April 29, 2023Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities$360 $(2)$1,125 $(40)$1,485 $(42)
U.S. government agency securities148 (1)110 (3)258 (4)
Non-U.S. government and agency securities291 — — — 291 — 
Corporate debt securities1,387 (14)4,869 (261)6,256 (275)
U.S. agency mortgage-backed securities343 (5)1,514 (203)1,857 (208)
Commercial paper69 — — — 69 — 
Certificates of deposit5 — — — 5 — 
Total$2,603 $(22)$7,618 $(507)$10,221 $(529)
 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 April 29, 2023 (in millions): 
Amortized CostFair Value
Within 1 year$5,821 $5,762 
After 1 year through 5 years7,340 7,067 
After 5 years through 10 years54 53 
After 10 years2 2 
Mortgage-backed securities with no single maturity2,221 2,014 
Total$15,438 $14,898