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Fair Value Measurements (Tables)
3 Months Ended
Oct. 31, 2020
Fair Value Disclosures [Abstract]  
Financial assets and liabilities measured at fair value on recurring basis
The following table summarizes financial assets and financial liabilities that we measured at fair value on a recurring basis at the dates indicated, classified in accordance with the fair value hierarchy described above.
October 31, 2020July 31, 2020
(In millions)Level 1Level 2Total
Fair Value
Level 1Level 2Total
Fair Value
Assets:      
Cash equivalents, primarily money market funds and time deposits$4,016 $— $4,016 $5,765 $— $5,765 
Available-for-sale debt securities:      
Municipal bonds— 17 17 — 
Corporate notes— 747 747 — 752 752 
U.S. agency securities— 55 55 — 47 47 
Total available-for-sale debt securities— 819 819 — 808 808 
Total assets measured at fair value on a recurring basis$4,016 $819 $4,835 $5,765 $808 $6,573 
Liabilities:
Senior unsecured notes(1)
$— $2,013 $2,013 $— $2,042 $2,042 
Cash equivalents and available-for-sale debt and equity securities by balance sheet classification and level in the fair value hierarchy
The following table summarizes our cash equivalents and available-for-sale debt securities by balance sheet classification and level in the fair value hierarchy at the dates indicated.
October 31, 2020July 31, 2020
(In millions)Level 1Level 2Total
Fair Value
Level 1Level 2Total
Fair Value
Cash equivalents:      
In cash and cash equivalents$4,016 $— $4,016 $5,765 $— $5,765 
Available-for-sale debt securities:      
In investments$— $619 $619 $— $608 $608 
In funds held for customers— 200 200 — 200 200 
Total available-for-sale debt securities$— $819 $819 $— $808 $808