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Debt - Summary of Term Debt (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 26, 2020 USD ($) | Sep. 26, 2020 EUR (€) | Sep. 28, 2019 USD ($)
Debt Instrument [Line Items] |  |  |
Total term debt | $ 106,078,000,000 |  | $ 101,679,000,000
Unamortized premium/(discount) and issuance costs, net | (314,000,000) |  | (224,000,000)
Hedge accounting fair value adjustments | 1,676,000,000 |  | 612,000,000
Less: Current portion of term debt | (8,773,000,000) |  | (10,260,000,000)
Total non-current portion of term debt | 98,667,000,000 |  | 91,807,000,000
2013 – 2019 debt issuances | Floating-rate notes |  |  |
Debt Instrument [Line Items] |  |  |
Total term debt | $ 2,250,000,000 |  | $ 4,250,000,000
Debt instrument, maturity year (calendar), start | 2021 |  |
Debt instrument, maturity year (calendar), end | 2022 |  |
2013 – 2019 debt issuances | Floating-rate notes | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, effective interest rate | 0.60% | 0.60% | 2.25%
2013 – 2019 debt issuances | Floating-rate notes | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, effective interest rate | 1.39% | 1.39% | 3.28%
2013 – 2019 debt issuances | Fixed-rate notes |  |  |
Debt Instrument [Line Items] |  |  |
Total term debt | $ 87,487,000,000 |  | $ 97,429,000,000
Debt instrument, maturity year (calendar), start | 2020 |  |
Debt instrument, maturity year (calendar), end | 2049 |  |
2013 – 2019 debt issuances | Fixed-rate notes | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 0.375% | 0.375% |
Debt instrument, effective interest rate | 0.28% | 0.28% | 0.28%
2013 – 2019 debt issuances | Fixed-rate notes | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 4.65% | 4.65% |
Debt instrument, effective interest rate | 4.78% | 4.78% | 4.78%
First quarter 2020 debt issuance |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | € |  | € 2,000,000,000.0 |
First quarter 2020 debt issuance | Fixed-rate notes |  |  |
Debt Instrument [Line Items] |  |  |
Total term debt | $ 2,341,000,000 |  | $ 0
Debt instrument, maturity year (calendar), start | 2025 |  |
Debt instrument, maturity year (calendar), end | 2031 |  |
Debt instrument, effective interest rate |  |  | 0.00%
First quarter 2020 debt issuance | Fixed-rate notes | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 0.00% | 0.00% |
Debt instrument, effective interest rate | 0.03% | 0.03% |
First quarter 2020 debt issuance | Fixed-rate notes | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 0.50% | 0.50% |
Debt instrument, effective interest rate | 0.56% | 0.56% |
Third quarter 2020 debt issuance |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 8,500,000,000 |  |
Third quarter 2020 debt issuance | Fixed-rate notes |  |  |
Debt Instrument [Line Items] |  |  |
Total term debt | $ 8,500,000,000 |  | $ 0
Debt instrument, maturity year (calendar), start | 2023 |  |
Debt instrument, maturity year (calendar), end | 2050 |  |
Debt instrument, effective interest rate |  |  | 0.00%
Third quarter 2020 debt issuance | Fixed-rate notes | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 0.75% | 0.75% |
Debt instrument, effective interest rate | 0.84% | 0.84% |
Third quarter 2020 debt issuance | Fixed-rate notes | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 2.65% | 2.65% |
Debt instrument, effective interest rate | 2.72% | 2.72% |
Fourth quarter 2020 debt issuance |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 5,500,000,000 |  |
Fourth quarter 2020 debt issuance | Fixed-rate notes |  |  |
Debt Instrument [Line Items] |  |  |
Total term debt | $ 5,500,000,000 |  | $ 0
Debt instrument, maturity year (calendar), start | 2025 |  |
Debt instrument, maturity year (calendar), end | 2060 |  |
Debt instrument, effective interest rate |  |  | 0.00%
Fourth quarter 2020 debt issuance | Fixed-rate notes | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 0.55% | 0.55% |
Debt instrument, effective interest rate | 0.60% | 0.60% |
Fourth quarter 2020 debt issuance | Fixed-rate notes | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, stated interest rate | 2.55% | 2.55% |
Debt instrument, effective interest rate | 2.59% | 2.59% |

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