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Revenue (Tables) | 6 Months Ended
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Jan. 29, 2022
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents this disaggregation of revenue (in millions):
| Three Months Ended |  | Six 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 Work | 1,067 |  |  | 1,167 |  |  | 2,176 |  |  | 2,360 |
End-to-End Security | 883 |  |  | 822 |  |  | 1,778 |  |  | 1,684 |
Internet for the Future | 1,322 |  |  | 931 |  |  | 2,697 |  |  | 1,872 |
Optimized Application Experiences | 180 |  |  | 161 |  |  | 361 |  |  | 314 |
Other Products | 2 |  |  | 3 |  |  | 5 |  |  | 6 |
Total Product | 9,353 |  |  | 8,572 |  |  | 18,882 |  |  | 17,159 |
Services | 3,367 |  |  | 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 Ended |  | Six 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 Work | 1,067 |  |  | 1,167 |  |  | 2,176 |  |  | 2,360 |
End-to-End Security | 883 |  |  | 822 |  |  | 1,778 |  |  | 1,684 |
Internet for the Future | 1,322 |  |  | 931 |  |  | 2,697 |  |  | 1,872 |
Optimized Application Experiences | 180 |  |  | 161 |  |  | 361 |  |  | 314 |
Other Products | 2 |  |  | 3 |  |  | 5 |  |  | 6 |
Total Product | 9,353 |  |  | 8,572 |  |  | 18,882 |  |  | 17,159 |
Services | 3,367 |  |  | 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 Ended |  | Six Months Ended
| January 29, 2022 |  | January 23, 2021 |  | January 29, 2022 |  | January 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 6 | 825 |  |  | 770 |
7 and Higher | 164 |  |  | 166 |
Total | $ | 1,453 |  |  | $ | 1,457 |

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