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

January 29, 2022Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit
Losses		Fair
Value
U.S. government securities$1,702 $4 $(19)$1,687 
U.S. government agency securities 142 — (2)140 
Corporate debt securities9,008 82 (102)8,988 
U.S. agency mortgage-backed securities2,569 10 (56)2,523 
Commercial paper614 — — 614 
Certificates of deposit209 — — 209 
Total$14,244 $96 $(179)$14,161 
July 31, 2021Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit
Losses		Fair
Value
U.S. government securities$1,773 $21 $— $1,794 
U.S. government agency securities 152 — — 152 
Non-U.S. government and agency securities3 — — 3 
Corporate debt securities8,727 213 (30)8,910 
U.S. agency mortgage-backed securities2,838 34 (10)2,862 
Commercial paper1,190 — — 1,190 
Certificates of deposit295 — — 295 
Total$14,978 $268 $(40)$15,206 
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 29, 2022January 23, 2021January 29, 2022January 23, 2021
Gross realized gains$13 $9 $19 $24 
Gross realized losses(3)— (3)— 
Total$10 $9 $16 $24 
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 29, 2022 and July 31, 2021 (in millions):
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
January 29, 2022Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities$1,124 $(19)$2 $— $1,126 $(19)
U.S. government agency securities125 (1)15 (1)140 (2)
Corporate debt securities4,230 (69)182 (8)4,412 (77)
U.S. agency mortgage-backed securities1,881 (52)91 (4)1,972 (56)
Total$7,360 $(141)$290 $(13)$7,650 $(154)
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
July 31, 2021Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities$468 $— $— $— $468 $— 
U.S. government agency securities26 — — — 26 — 
Corporate debt securities1,086 (5)6 — 1,092 (5)
U.S. agency mortgage-backed securities1,293 (10)13 — 1,306 (10)
Commercial paper37 — — — 37 — 
Total$2,910 $(15)$19 $— $2,929 $(15)
Maturities of Available-for-Sale Debt Investments
The following table summarizes the maturities of our available-for-sale debt investments as of January 29, 2022 (in millions): 
Amortized CostFair Value
Within 1 year$3,512 $3,496 
After 1 year through 5 years7,999 7,969 
After 5 years through 10 years162 171 
After 10 years2 2 
Mortgage-backed securities with no single maturity2,569 2,523 
Total$14,244 $14,161