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Revenue (Tables) | 3 Months Ended
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Oct. 30, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents this disaggregation of revenue (in millions):
| Three Months Ended
| October 30, 2021 |  | October 24, 2020
Product revenue: |  |  |
Secure, Agile Networks | $ | 5,967 |  |  | $ | 5,434 |
Hybrid Work | 1,109 |  |  | 1,193 |
End-to-End Security | 895 |  |  | 861 |
Internet for the Future | 1,374 |  |  | 942 |
Optimized Application Experiences | 181 |  |  | 153 |
Other Products | 3 |  |  | 3 |
Total Product | 9,529 |  |  | 8,587 |
Services | 3,371 |  |  | 3,342 |
Total | $ | 12,900 |  |  | $ | 11,929 |
The following table presents revenue for groups of similar products and services (in millions):
| Three Months Ended
| October 30, 2021 |  | October 24, 2020
Revenue: |  |  |
Secure, Agile Networks | $ | 5,967 |  |  | $ | 5,434 |
Hybrid Work | 1,109 |  |  | 1,193 |
End-to-End Security | 895 |  |  | 861 |
Internet for the Future | 1,374 |  |  | 942 |
Optimized Application Experiences | 181 |  |  | 153 |
Other Products | 3 |  |  | 3 |
Total Product | 9,529 |  |  | 8,587 |
Services | 3,371 |  |  | 3,342 |
Total | $ | 12,900 |  |  | $ | 11,929 |
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
| October 30, 2021 |  | October 24, 2020
Allowance for credit loss at beginning of period | $ | 109 |  |  | $ | 143 |
Provisions (benefits) | 19 |  |  | 14 |
Recoveries (write-offs), net | (14) |  |  | (6) |
Foreign exchange and other | — |  |  | (26) |
Allowance for credit loss at end of period | $ | 114 |  |  | $ | 125 |
Schedule of Gross Contract Assets by Internal Risk Ratings | Gross contract assets by our internal risk ratings are summarized as follows (in millions):
| October 30, 2021 |  | July 31, 2021
1 to 4 | $ | 445 |  |  | $ | 521 |
5 to 6 | 839 |  |  | 770 |
7 and Higher | 154 |  |  | 166 |
Total | $ | 1,438 |  |  | $ | 1,457 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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