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Fair Value Measurements (Tables)
 12 Months Ended
Jul. 31, 2022
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.
 At July 31, 2022At July 31, 2021
(In millions)Level 1Level 2Total
Fair Value		Level 1Level 2Total
Fair Value
Assets:      
Cash equivalents, primarily money market funds and time deposits$1,835 $— $1,835 $1,660 $— $1,660 
Available-for-sale debt securities:    
Municipal bonds— — — — 38 38 
Corporate notes— 589 589 — 1,400 1,400 
U.S. agency securities— 96 96 — 70 70 
Total available-for-sale securities— 685 685 — 1,508 1,508 
Total assets measured at fair value on a recurring basis$1,835 $685 $2,520 $1,660 $1,508 $3,168 
Liabilities:
Senior unsecured notes(1)
$— $1,838 $1,838 $— $1,986 $1,986 
(1) Carrying value on our consolidated balance sheets were $1.99 billion at both July 31, 2022 and July 31, 2021. See Note 8, “Debt” for more information.
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 shown:
 At July 31, 2022At July 31, 2021
(In millions)Level 1Level 2Total
Fair Value		Level 1Level 2Total
Fair Value
Cash equivalents:      
In cash and cash equivalents$1,835 $— $1,835 $1,660 $— $1,660 
Available-for-sale debt securities:      
In investments$— $485 $485 $— $1,308 $1,308 
In funds receivable and amounts held for customers— 200 200 — 200 200 
Total available-for-sale debt securities$— $685 $685 $— $1,508 $1,508