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Summary of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified | Mar. 28, 2015 | Sep. 27, 2014
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Debt Instrument [Line Items] |  |  |  |
Total borrowings | $ 39,875 us-gaap_DebtInstrumentCarryingAmount |  | $ 29,000 us-gaap_DebtInstrumentCarryingAmount |
Unamortized discount | (80)us-gaap_DebtInstrumentUnamortizedDiscount |  | (52)us-gaap_DebtInstrumentUnamortizedDiscount |
Hedge accounting fair value adjustments | 277 aapl_HedgeAccountingAdjustmentsRelatedToLongTermDebt |  | 39 aapl_HedgeAccountingAdjustmentsRelatedToLongTermDebt |
Total long-term debt | 40,072 us-gaap_LongTermDebt |  | 28,987 us-gaap_LongTermDebt |
Floating-rate notes due 2016 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentySixteenMember | [1] | 1,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentySixteenMember | [1]
Debt instrument effective interest rate | 0.51%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentySixteenMember | [1] | 0.51%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentySixteenMember | [1]
Floating-rate notes due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentySeventeenMember | [2] | 1,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentySeventeenMember | [2]
Debt instrument effective interest rate | 0.33%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentySeventeenMember | [2] | 0.31%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentySeventeenMember | [2]
Floating-rate notes due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 2,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyEighteenMember | [1] | 2,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyEighteenMember | [1]
Debt instrument effective interest rate | 1.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyEighteenMember | [1] | 1.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyEighteenMember | [1]
Floating-rate notes due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyNineteenMember | [2] | 1,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyNineteenMember | [2]
Debt instrument effective interest rate | 0.56%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyNineteenMember | [2] | 0.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyNineteenMember | [2]
Floating-rate notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 500 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyTwentyMember | [3] | 0 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyTwentyMember | [3]
Debt instrument effective interest rate | 0.51%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyTwentyMember | [3] | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesDueTwentyTwentyMember | [3]
Fixed-rate 0.45% notes due 2016 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,500 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesZeroPointFourFivePercentDueTwentySixteenMember | [1] | 1,500 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesZeroPointFourFivePercentDueTwentySixteenMember | [1]
Debt instrument effective interest rate | 0.51%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesZeroPointFourFivePercentDueTwentySixteenMember | [1] | 0.51%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesZeroPointFourFivePercentDueTwentySixteenMember | [1]
Fixed-rate 1.05% notes due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,500 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointZeroFivePercentDueTwentySeventeenMember | [2] | 1,500 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointZeroFivePercentDueTwentySeventeenMember | [2]
Debt instrument effective interest rate | 0.32%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointZeroFivePercentDueTwentySeventeenMember | [2] | 0.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointZeroFivePercentDueTwentySeventeenMember | [2]
Fixed-rate 1.00% notes due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 4,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointZeroPercentDueTwentyEighteenMember | [1] | 4,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointZeroPercentDueTwentyEighteenMember | [1]
Debt instrument effective interest rate | 1.08%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointZeroPercentDueTwentyEighteenMember | [1] | 1.08%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointZeroPercentDueTwentyEighteenMember | [1]
Fixed-rate 2.10% notes due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 2,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointOneZeroPercentDueTwentyNineteenMember | [2] | 2,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointOneZeroPercentDueTwentyNineteenMember | [2]
Debt instrument effective interest rate | 0.55%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointOneZeroPercentDueTwentyNineteenMember | [2] | 0.53%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointOneZeroPercentDueTwentyNineteenMember | [2]
Fixed-rate 1.55% notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,250 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointFiveFivePercentDueTwentyTwentyMember | [3] | 0 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointFiveFivePercentDueTwentyTwentyMember | [3]
Debt instrument effective interest rate | 0.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointFiveFivePercentDueTwentyTwentyMember | [3] | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesOnePointFiveFivePercentDueTwentyTwentyMember | [3]
Fixed-rate 2.85% notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 3,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointEightFivePercentDueTwentyTwentyOneMember | [2] | 3,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointEightFivePercentDueTwentyTwentyOneMember | [2]
Debt instrument effective interest rate | 0.81%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointEightFivePercentDueTwentyTwentyOneMember | [2] | 0.79%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointEightFivePercentDueTwentyTwentyOneMember | [2]
Fixed-rate 2.15% notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,250 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointOneFivePercentDueTwentyTwentyTwoMember | [3] | 0 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointOneFivePercentDueTwentyTwentyTwoMember | [3]
Debt instrument effective interest rate | 0.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointOneFivePercentDueTwentyTwentyTwoMember | [3] | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointOneFivePercentDueTwentyTwentyTwoMember | [3]
Fixed-rate 1.00% Euro-denominated notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,534 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_EuroDenominatedSeniorNotesOnePointZeroPercentDueTwentyTwentyTwoMember | [4] | 0 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_EuroDenominatedSeniorNotesOnePointZeroPercentDueTwentyTwentyTwoMember | [4]
Debt instrument effective interest rate | 2.94%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_EuroDenominatedSeniorNotesOnePointZeroPercentDueTwentyTwentyTwoMember | [4] | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_EuroDenominatedSeniorNotesOnePointZeroPercentDueTwentyTwentyTwoMember | [4]
Fixed-rate 2.40% notes due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 5,500 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointFourZeroPercentDueTwentyTwentyThreeMember | [1] | 5,500 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointFourZeroPercentDueTwentyTwentyThreeMember | [1]
Debt instrument effective interest rate | 2.44%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointFourZeroPercentDueTwentyTwentyThreeMember | [1] | 2.44%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointFourZeroPercentDueTwentyTwentyThreeMember | [1]
Fixed-rate 3.45% notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 2,500 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointFourFivePercentDueTwentyTwentyFourMember | [2] | 2,500 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointFourFivePercentDueTwentyTwentyFourMember | [2]
Debt instrument effective interest rate | 0.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointFourFivePercentDueTwentyTwentyFourMember | [2] | 0.90%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointFourFivePercentDueTwentyTwentyFourMember | [2]
Fixed-rate 0.38% Swiss Franc-denominated notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 915 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SwissFrancDenominatedSeniorNotesZeroPointThreeEightPercentDueTwentyTwentyFourMember | [5] | 0 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SwissFrancDenominatedSeniorNotesZeroPointThreeEightPercentDueTwentyTwentyFourMember | [5]
Debt instrument effective interest rate | 0.28%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SwissFrancDenominatedSeniorNotesZeroPointThreeEightPercentDueTwentyTwentyFourMember | [5] | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SwissFrancDenominatedSeniorNotesZeroPointThreeEightPercentDueTwentyTwentyFourMember | [5]
Fixed-rate 2.50% notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,500 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentyFiveMember | [3] | 0 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentyFiveMember | [3]
Debt instrument effective interest rate | 2.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentyFiveMember | [3] | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesTwoPointFiveZeroPercentDueTwentyTwentyFiveMember | [3]
Fixed-rate 1.63% Euro-denominated notes due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,534 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_EuroDenominatedSeniorNotesOnePointSixThreePercentDueTwentyTwentySixMember | [4] | 0 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_EuroDenominatedSeniorNotesOnePointSixThreePercentDueTwentyTwentySixMember | [4]
Debt instrument effective interest rate | 3.45%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_EuroDenominatedSeniorNotesOnePointSixThreePercentDueTwentyTwentySixMember | [4] | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_EuroDenominatedSeniorNotesOnePointSixThreePercentDueTwentyTwentySixMember | [4]
Fixed-rate 0.75% Swiss Franc-denominated notes due 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 392 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SwissFrancDenominatedSeniorNotesZeroPointSevenFivePercentDueTwentyThirtyMember | [5] | 0 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SwissFrancDenominatedSeniorNotesZeroPointSevenFivePercentDueTwentyThirtyMember | [5]
Debt instrument effective interest rate | 0.74%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SwissFrancDenominatedSeniorNotesZeroPointSevenFivePercentDueTwentyThirtyMember | [5] | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SwissFrancDenominatedSeniorNotesZeroPointSevenFivePercentDueTwentyThirtyMember | [5]
Fixed-rate 3.85% notes due 2043 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 3,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointEightFivePercentDueTwentyFortyThreeMember | [1] | 3,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointEightFivePercentDueTwentyFortyThreeMember | [1]
Debt instrument effective interest rate | 3.91%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointEightFivePercentDueTwentyFortyThreeMember | [1] | 3.91%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointEightFivePercentDueTwentyFortyThreeMember | [1]
Fixed-rate 4.45% notes due 2044 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | 1,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesFourPointFourFivePercentDueTwentyFortyFourMember | [2] | 1,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesFourPointFourFivePercentDueTwentyFortyFourMember | [2]
Debt instrument effective interest rate | 4.48%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesFourPointFourFivePercentDueTwentyFortyFourMember | [2] | 4.48%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesFourPointFourFivePercentDueTwentyFortyFourMember | [2]
Fixed-rate 3.45% notes due 2045 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 2,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointFourFivePercentDueTwentyFortyFiveMember | [3] | $ 0 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointFourFivePercentDueTwentyFortyFiveMember | [3]
Debt instrument effective interest rate | 3.58%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointFourFivePercentDueTwentyFortyFiveMember | [3] | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = aapl_SeniorNotesThreePointFourFivePercentDueTwentyFortyFiveMember | [3]
[1] | Tranche relates to the $17.0 billion debt issuance in the third quarter of 2013.
[2] | Tranche relates to the $12.0 billion debt issuance in the third quarter of 2014.
[3] | Tranche relates to the $6.5 billion debt issuance in the second quarter of 2015.
[4] | Tranche relates to Euro-denominated debt issuance of €2.8 billion in the first quarter of 2015.
[5] | Tranche relates to Swiss Franc-denominated debt issuance of SFr1.3 billion in the second quarter of 2015.

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