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Fair Value (Tables)
 12 Months Ended
Jul. 31, 2021
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets and liabilities measured at fair value on a recurring basis were as follows (in millions):
JULY 31, 2021JULY 25, 2020
FAIR VALUE MEASUREMENTSFAIR VALUE MEASUREMENTS
Level 1Level 2Total
Balance		Level 1Level 2Level 3Total
Balance
Assets:
Cash equivalents:
Money market funds$5,694 $— $5,694 $9,687 $— $— $9,687 
Commercial paper— 114 114 — — — — 
U.S. government securities— 300 300 — — — — 
Corporate debt securities— — — — 8 — 8 
Available-for-sale debt investments:
U.S. government securities— 1,794 1,794 — 2,685 — 2,685 
U.S. government agency securities— 152 152 — 110 — 110 
Corporate debt securities— 8,910 8,910 — 11,877 — 11,877 
U.S. agency mortgage-backed securities— 2,862 2,862 — 2,035 — 2,035 
Non-U.S. government agency securities— 3 3 — — — — 
Commercial paper— 1,190 1,190 — 727 — 727 
Certificates of deposit— 295 295 — 176 — 176 
Equity investments:
Marketable equity securities137 — 137 — — — — 
Other assets:
Money market funds750 — 750 — — — — 
Derivative assets— 126 126 — 190 1 191 
Total$6,581 $15,746 $22,327 $9,687 $17,808 $1 $27,496 
Liabilities:
Derivative liabilities$— $20 $20 $— $10 $— $10 
Total$— $20 $20 $— $10 $— $10