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Fair Value Measurements (Tables)
 9 Months Ended
Apr. 30, 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.
April 30, 2022July 31, 2021
(In millions)Level 1Level 2Total
Fair Value		Level 1Level 2Total
Fair Value
Assets:      
Cash equivalents, primarily money market funds and time deposits$2,627 $— $2,627 $1,660 $— $1,660 
Available-for-sale debt securities:      
Municipal bonds— — — — 38 38 
Corporate notes— 514 514 — 1,400 1,400 
U.S. agency securities— 59 59 — 70 70 
Total available-for-sale debt securities— 573 573 — 1,508 1,508 
Total assets measured at fair value on a recurring basis$2,627 $573 $3,200 $1,660 $1,508 $3,168 
Liabilities:
Senior unsecured notes(1)
$— $1,818 $1,818 $— $1,986 $1,986 
(1) Carrying value on our balance sheets at April 30, 2022 and July 31, 2021 was $1.99 billion. See Note 7, “Long-Term Obligations and Commitments,” 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 indicated.
April 30, 2022July 31, 2021
(In millions)Level 1Level 2Total
Fair Value		Level 1Level 2Total
Fair Value
Cash equivalents:      
In cash and cash equivalents$2,610 $— $2,610 $1,660 $— $1,660 
In funds held for customers17 — 17 — — — 
Total cash equivalents$2,627 $— $2,627 $1,660 $— $1,660 
Available-for-sale debt securities:      
In investments$— $373 $373 $— $1,308 $1,308 
In funds held for customers— 200 200 — 200 200 
Total available-for-sale debt securities$— $573 $573 $— $1,508 $1,508