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Financial Instruments - Notional Amounts and Credit Risk Amounts Associated with Derivative Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Sep. 30, 2017
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Derivatives designated as accounting hedges | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 48,122 | $ 56,156
Derivative, credit risk amount | 1,361 | 1,049
Derivatives designated as accounting hedges | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 35,250 | 33,000
Derivative, credit risk amount | 12 | 218
Derivatives not designated as accounting hedges | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 61,179 | 69,774
Derivative, credit risk amount | $ 290 | $ 363

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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 Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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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- Details
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- Details
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- Details
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- Details
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