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Revenue (Tables)
 9 Months Ended
Apr. 29, 2023
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue The following table presents this disaggregation of revenue (in millions):
Three Months EndedNine Months Ended
April 29,
2023		April 30,
2022		April 29, 2023April 30, 2022
Product revenue:
Secure, Agile Networks$7,550 $5,870 $20,980 $17,737 
Internet for the Future1,392 1,324 4,007 4,019 
Collaboration985 1,132 3,029 3,308 
End-to-End Security958 938 2,872 2,716 
Optimized Application Experiences204 183 597 544 
Other Products3 2 7 7 
Total Product11,092 9,448 31,492 28,330 
Services3,479 3,387 10,303 10,125 
Total$14,571 $12,835 $41,795 $38,455 
The following table presents revenue for groups of similar products and services (in millions):
Three Months EndedNine Months Ended
April 29,
2023		April 30,
2022		April 29,
2023		April 30,
2022
Revenue:
Secure, Agile Networks$7,550 $5,870 $20,980 $17,737 
Internet for the Future1,392 1,324 4,007 4,019 
Collaboration985 1,132 3,029 3,308 
End-to-End Security958 938 2,872 2,716 
Optimized Application Experiences204 183 597 544 
Other Products3 2 7 7 
Total Product11,092 9,448 31,492 28,330 
Services3,479 3,387 10,303 10,125 
Total$14,571 $12,835 $41,795 $38,455 
Allowance for Credit Loss for Accounts Receivable
The allowances for credit loss for our accounts receivable are summarized as follows (in millions):
Three Months EndedNine Months Ended
April 29, 2023April 30, 2022April 29, 2023April 30, 2022
Allowance for credit loss at beginning of period$86 $70 $83 $109 
Provisions (benefits)9 17 23 53 
Recoveries (write-offs), net(12)(9)(23)(75)
Foreign exchange and other— — — (9)
Allowance for credit loss at end of period$83 $78 $83 $78 
Schedule of Gross Contract Assets by Internal Risk Ratings
Gross contract assets by our internal risk ratings are summarized as follows (in millions):
April 29,
2023		July 30,
2022
1 to 4$456 $414 
5 to 6933 814 
7 and Higher71 158 
Total$1,460 $1,386