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Available-for-Sale Debt and Equity Investments (Tables)
 3 Months Ended
Oct. 24, 2020
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 24, 2020Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized and Credit
Losses		Fair
Value
U.S. government securities$2,656 $61 $— $2,717 
U.S. government agency securities 178 — — 178 
Corporate debt securities11,266 298 (27)11,537 
U.S. agency mortgage-backed securities2,494 41 (6)2,529 
Commercial paper1,712 — — 1,712 
Certificates of deposit517 — — 517 
Total (1)
$18,823 $400 $(33)$19,190 
July 25, 2020Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. government securities$2,614 $71 $— $2,685 
U.S. government agency securities 110 — — 110 
Corporate debt securities11,549 334 (6)11,877 
U.S. agency mortgage-backed securities1,987 49 (1)2,035 
Commercial paper727 — — 727 
Certificates of deposit176 — — 176 
Total$17,163 $454 $(7)$17,610 
(1) Net unsettled investment sales were $57 million as of October 24, 2020 and were included in other current assets.
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 24, 2020October 26, 2019
Gross realized gains$15 $12 
Gross realized losses— (2)
Total$15 $10 
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 24, 2020 and July 25, 2020 (in millions):
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
October 24, 2020Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government securities 
$144 $— $— $— $144 $— 
U.S. government agency securities65 — — — 65 — 
Corporate debt securities1,008 (2)— — 1,008 (2)
U.S. agency mortgage-backed securities1,076 (6)— — 1,076 (6)
Certificates of deposit15 — — — 15 — 
Total$2,308 $(8)$— $— $2,308 $(8)
 UNREALIZED LOSSES
LESS THAN 12 MONTHS		UNREALIZED LOSSES
12 MONTHS OR GREATER		TOTAL
July 25, 2020Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross 
Unrealized 
Losses
U.S. government agency securities$33 $— $— $— $33 $— 
Corporate debt securities1,060 (6)3 — 1,063 (6)
U.S. agency mortgage-backed securities265 (1)— — 265 (1)
Total$1,358 $(7)$3 $— $1,361 $(7)
Maturities of Fixed Income Securities
The following table summarizes the maturities of our available-for-sale debt investments as of October 24, 2020 (in millions): 
Amortized CostFair Value
Within 1 year$7,480 $7,490 
After 1 year through 5 years6,897 7,052 
After 5 years through 10 years1,943 2,109 
After 10 years9 10 
Mortgage-backed securities with no single maturity2,494 2,529 
Total$18,823 $19,190