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Revenue - Schedule of Internal Risk Ratings for Contract Assets (Details) - USD ($) $ in Millions | Jan. 29, 2022 | Jul. 31, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Contract asset, gross | $ 1,453 | $ 1,457
1 to 4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Contract asset, gross | 464 | 521
5 to 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Contract asset, gross | 825 | 770
7 and Higher |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Contract asset, gross | $ 164 | $ 166

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