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Revenue (Tables)
 12 Months Ended
Jul. 30, 2022
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table presents this disaggregation of revenue (in millions):
Years EndedJuly 30, 2022July 31, 2021July 25, 2020
Product revenue:
Secure, Agile Networks$23,829 $22,722 $23,265 
Internet for the Future5,278 4,514 4,180 
Collaboration4,472 4,727 4,823 
End-to-End Security3,699 3,382 3,158 
Optimized Application Experiences729 654 524 
Other Products11 15 28 
Total Product38,018 36,014 35,978 
Services13,539 13,804 13,323 
Total$51,557 $49,818 $49,301 
The following table presents revenue for groups of similar products and services (in millions):
Years EndedJuly 30, 2022July 31, 2021July 25, 2020
Revenue:
Secure, Agile Networks$23,829 $22,722 $23,265 
Internet for the Future5,278 4,514 4,180 
Collaboration4,472 4,727 4,823 
End-to-End Security3,699 3,382 3,158 
Optimized Application Experiences729 654 524 
Other Products11 15 28 
Total Product38,018 36,014 35,978 
Services13,539 13,804 13,323 
Total$51,557 $49,818 $49,301 
Allowance for Credit Loss for Accounts Receivable
The allowances for credit loss for our accounts receivable are summarized as follows (in millions):
July 30, 2022July 31, 2021July 25, 2020
Allowance for credit loss at beginning of fiscal year$109 $143 $136 
Provisions (benefits)64 21 55 
Recoveries (write-offs), net(81)(29)(48)
Foreign exchange and other(9)(26)— 
Allowance for credit loss at end of fiscal year$83 $109 $143 
Schedule of Gross Contract Assets by Internal Risk Ratings
Gross contract assets by our internal risk ratings are summarized as follows (in millions):
July 30, 2022July 31, 2021
1 to 4$414 $521 
5 to 6814 770 
7 and Higher158 166 
Total$1,386 $1,457