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Revenue (Tables)
 6 Months Ended
Jan. 29, 2022
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 29,
2022		January 23,
2021		January 29,
2022		January 23,
2021
Product revenue:
Secure, Agile Networks$5,898 $5,489 $11,866 $10,923 
Hybrid Work1,067 1,167 2,176 2,360 
End-to-End Security883 822 1,778 1,684 
Internet for the Future1,322 931 2,697 1,872 
Optimized Application Experiences180 161 361 314 
Other Products2 3 5 6 
Total Product9,353 8,572 18,882 17,159 
Services3,367 3,388 6,738 6,730 
Total$12,720 $11,960 $25,620 $23,889 
The following table presents revenue for groups of similar products and services (in millions):
Three Months EndedSix Months Ended
January 29,
2022		January 23,
2021		January 29,
2022		January 23,
2021
Revenue:
Secure, Agile Networks$5,898 $5,489 $11,866 $10,923 
Hybrid Work1,067 1,167 2,176 2,360 
End-to-End Security883 822 1,778 1,684 
Internet for the Future1,322 931 2,697 1,872 
Optimized Application Experiences180 161 361 314 
Other Products2 3 5 6 
Total Product9,353 8,572 18,882 17,159 
Services3,367 3,388 6,738 6,730 
Total$12,720 $11,960 $25,620 $23,889 
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 29, 2022January 23, 2021January 29, 2022January 23, 2021
Allowance for credit loss at beginning of period$114 $125 $109 $143 
Provisions (benefits)17 (15)36 (1)
Recoveries (write-offs), net(52)(8)(66)(14)
Foreign exchange and other(9)— (9)(26)
Allowance for credit loss at end of period$70 $102 $70 $102 
Schedule of Gross Contract Assets by Internal Risk Ratings
Gross contract assets by our internal risk ratings are summarized as follows (in millions):
January 29,
2022		July 31,
2021
1 to 4$464 $521 
5 to 6825 770 
7 and Higher164 166 
Total$1,453 $1,457