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Financial Instruments - Notional Amounts and Credit Risk Amounts Associated with Derivative Instruments (Details) - USD ($) $ in Millions | Sep. 26, 2020 | Sep. 28, 2019
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Derivatives designated as accounting hedges | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivatives, notional amount | $ 57,410 | $ 61,795
Derivatives, credit risk amount | 749 | 1,798
Derivatives designated as accounting hedges | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivatives, notional amount | 20,700 | 31,250
Derivatives, credit risk amount | 1,557 | 685
Derivatives not designated as accounting hedges | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivatives, notional amount | 88,636 | 76,868
Derivatives, credit risk amount | $ 303 | $ 323

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- Definition Gross exposure to potential accounting loss on outstanding or unsettled derivative instruments that would arise if all counterparties failed to perform according to the terms of the contract. + References No definition available. + Details
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Namespace Prefix: | aapl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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 No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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Balance Type: | na
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |