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Goodwill and Purchased Intangible Assets - Schedule of Amortization of Purchased Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 23, 2021 | Jan. 25, 2020 | Jan. 23, 2021 | Jan. 25, 2020
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of purchased intangible assets | $ 39 | $ 38 | $ 75 | $ 74
Total |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of purchased intangible assets | 195 | 203 | 401 | 405
Cost of sales |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of purchased intangible assets | 156 | 165 | 326 | 331
Operating expenses |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of purchased intangible assets | $ 39 | $ 38 | $ 75 | $ 74

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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