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Available-for-Sale Debt and Equity Investments (Tables)
 6 Months Ended
Jan. 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):

January 28, 2023Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit
Losses		Fair
Value
U.S. government securities$2,050 $2 $(54)$1,998 
U.S. government agency securities 169 — (5)164 
Non-U.S. government and agency securities354 — (1)353 
Corporate debt securities7,480 5 (345)7,140 
U.S. agency mortgage-backed securities2,013 2 (188)1,827 
Commercial paper1,029 — — 1,029 
Certificates of deposit261 — — 261 
Total$13,356 $9 $(593)$12,772 
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 EndedSix Months Ended
January 28, 2023January 29, 2022January 28, 2023January 29, 2022
Gross realized gains$3 $13 $3 $19 
Gross realized losses(6)(3)(12)(3)
Total$(3)$10 $(9)$16 
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 January 28, 2023 and July 30, 2022 (in millions):
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
January 28, 2023Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities$470 $(6)$1,086 $(48)$1,556 $(54)
U.S. government agency securities33 — 121 (5)154 (5)
Non-U.S. government and agency securities339 (1)— — 339 (1)
Corporate debt securities2,770 (94)3,333 (219)6,103 (313)
U.S. agency mortgage-backed securities305 (12)1,440 (176)1,745 (188)
Commercial paper40 — — — 40 — 
Total$3,957 $(113)$5,980 $(448)$9,937 $(561)
 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 January 28, 2023 (in millions): 
Amortized CostFair Value
Within 1 year$4,806 $4,734 
After 1 year through 5 years6,491 6,170 
After 5 years through 10 years46 41 
Mortgage-backed securities with no single maturity2,013 1,827 
Total$13,356 $12,772