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Revenue (Tables)
 6 Months Ended
Jan. 28, 2023
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue The following table presents this disaggregation of revenue (in millions):
Three Months EndedSix Months Ended
January 28,
2023		January 29,
2022		January 28, 2023January 29, 2022
Product revenue:
Secure, Agile Networks$6,746 $5,899 $13,430 $11,867 
Internet for the Future1,306 1,322 2,616 2,695 
Collaboration958 1,067 2,044 2,176 
End-to-End Security943 883 1,914 1,778 
Optimized Application Experiences199 180 393 361 
Other Products3 2 4 5 
Total Product10,155 9,353 20,400 18,882 
Services3,437 3,367 6,824 6,738 
Total$13,592 $12,720 $27,224 $25,620 
The following table presents revenue for groups of similar products and services (in millions):
Three Months EndedSix Months Ended
January 28,
2023		January 29,
2022		January 28,
2023		January 29,
2022
Revenue:
Secure, Agile Networks$6,746 $5,899 $13,430 $11,867 
Internet for the Future1,306 1,322 2,616 2,695 
Collaboration958 1,067 2,044 2,176 
End-to-End Security943 883 1,914 1,778 
Optimized Application Experiences199 180 393 361 
Other Products3 2 4 5 
Total Product10,155 9,353 20,400 18,882 
Services3,437 3,367 6,824 6,738 
Total$13,592 $12,720 $27,224 $25,620 
Allowance for Credit Loss for Accounts Receivable
The allowances for credit loss for our accounts receivable are summarized as follows (in millions):
Three Months EndedSix Months Ended
January 28, 2023January 29, 2022January 28, 2023January 29, 2022
Allowance for credit loss at beginning of period$88 $114 $83 $109 
Provisions (benefits)3 17 14 36 
Recoveries (write-offs), net(5)(52)(11)(66)
Foreign exchange and other— (9)— (9)
Allowance for credit loss at end of period$86 $70 $86 $70 
Schedule of Gross Contract Assets by Internal Risk Ratings
Gross contract assets by our internal risk ratings are summarized as follows (in millions):
January 28,
2023		July 30,
2022
1 to 4$355 $414 
5 to 6984 814 
7 and Higher82 158 
Total$1,421 $1,386