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Composition of Certain Financial Statement Items Other Assets (Details) - USD ($) $ in Millions | Jun. 28, 2026 | Sep. 28, 2025
--- | --- | ---
Long-Term Purchase Commitment [Line Items] |  |
Advance payment related to multi-year capacity commitments | $ 769 | $ 1,900
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssets |  |
Long-Term Purchase Commitment [Line Items] |  |
Advance payment related to multi-year capacity commitments | 574 | 357
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent |  |
Long-Term Purchase Commitment [Line Items] |  |
Advance payment related to multi-year capacity commitments | $ 195 | $ 1,500

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- Definition Advance payment related to multi-year capacity commitments + References No definition available. + Details
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Namespace Prefix: | qcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 440 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482648/440-10-50-4 + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |