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Debt - Summary of Term Debt (Details) - USD ($) | 9 Months Ended |
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Jun. 29, 2019 | Sep. 29, 2018
Debt Instrument [Line Items] |  |
Total term debt | $ 98,322,000,000 | $ 104,193,000,000
Unamortized premium/(discount) and issuance costs, net | (194,000,000) | (218,000,000)
Hedge accounting fair value adjustments | 337,000,000 | (1,456,000,000)
Less: Current portion of term debt | (13,529,000,000) | (8,784,000,000)
Total non-current portion of term debt | 84,936,000,000 | 93,735,000,000
2013 debt issuance of $17.0 billion |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | 17,000,000,000 |
2013 debt issuance of $17.0 billion | Fixed-rate 2.400% – 3.850% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 8,500,000,000 | $ 8,500,000,000
Debt instrument, maturity year (calendar), start | 2023 |
Debt instrument, maturity year (calendar), end | 2043 |
2013 debt issuance of $17.0 billion | Fixed-rate 2.400% – 3.850% notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 2.40% |
Debt instrument, effective interest rate | 2.44% | 2.44%
2013 debt issuance of $17.0 billion | Fixed-rate 2.400% – 3.850% notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 3.85% |
Debt instrument, effective interest rate | 3.91% | 3.91%
2014 debt issuance of $12.0 billion |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 12,000,000,000 |
2014 debt issuance of $12.0 billion | Floating-rate notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 0 | $ 1,000,000,000
Debt instrument, effective interest rate | 0.00% | 2.64%
2014 debt issuance of $12.0 billion | Fixed-rate 2.850% – 4.450% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 6,500,000,000 | $ 8,500,000,000
Debt instrument, maturity year (calendar), start | 2021 |
Debt instrument, maturity year (calendar), end | 2044 |
2014 debt issuance of $12.0 billion | Fixed-rate 2.850% – 4.450% notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 2.85% |
Debt instrument, effective interest rate | 3.12% | 2.64%
2014 debt issuance of $12.0 billion | Fixed-rate 2.850% – 4.450% notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 4.45% |
Debt instrument, effective interest rate | 4.48% | 4.48%
2015 debt issuances of $27.3 billion |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 27,300,000,000 |
2015 debt issuances of $27.3 billion | Floating-rate notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 1,488,000,000 | $ 1,507,000,000
Debt instrument, maturity year (calendar), start | 2019 |
Debt instrument, maturity year (calendar), end | 2020 |
2015 debt issuances of $27.3 billion | Floating-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 1.87% | 1.87%
2015 debt issuances of $27.3 billion | Floating-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 2.84% | 2.64%
2015 debt issuances of $27.3 billion | Fixed-rate 0.350% – 4.375% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 24,223,000,000 | $ 24,410,000,000
Debt instrument, maturity year (calendar), start | 2019 |
Debt instrument, maturity year (calendar), end | 2045 |
2015 debt issuances of $27.3 billion | Fixed-rate 0.350% – 4.375% notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 0.35% |
Debt instrument, effective interest rate | 0.28% | 0.28%
2015 debt issuances of $27.3 billion | Fixed-rate 0.350% – 4.375% notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 4.375% |
Debt instrument, effective interest rate | 4.51% | 4.51%
2016 debt issuances of $24.9 billion |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 24,900,000,000 |
2016 debt issuances of $24.9 billion | Floating-rate notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 850,000,000 | $ 1,350,000,000
Debt instrument, maturity year (calendar), start | 2019 |
Debt instrument, maturity year (calendar), end | 2021 |
2016 debt issuances of $24.9 billion | Floating-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 2.71% | 2.48%
2016 debt issuances of $24.9 billion | Floating-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 3.65% | 3.44%
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 22,022,000,000 | $ 23,059,000,000
Debt instrument, maturity year (calendar), start | 2019 |
Debt instrument, maturity year (calendar), end | 2046 |
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 1.10% |
Debt instrument, effective interest rate | 1.13% | 1.13%
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 4.65% |
Debt instrument, effective interest rate | 4.78% | 4.78%
2017 debt issuances of $28.7 billion |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 28,700,000,000 |
2017 debt issuances of $28.7 billion | Floating-rate notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 2,750,000,000 | $ 3,250,000,000
Debt instrument, maturity year (calendar), start | 2020 |
Debt instrument, maturity year (calendar), end | 2022 |
2017 debt issuances of $28.7 billion | Floating-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 2.61% | 2.41%
2017 debt issuances of $28.7 billion | Floating-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 3.06% | 2.84%
2017 debt issuances of $28.7 billion | Fixed-rate 0.875% – 4.300% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 24,989,000,000 | $ 25,617,000,000
Debt instrument, maturity year (calendar), start | 2019 |
Debt instrument, maturity year (calendar), end | 2047 |
2017 debt issuances of $28.7 billion | Fixed-rate 0.875% – 4.300% notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 0.875% |
Debt instrument, effective interest rate | 1.54% | 1.54%
2017 debt issuances of $28.7 billion | Fixed-rate 0.875% – 4.300% notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 4.30% |
Debt instrument, effective interest rate | 4.30% | 4.30%
2018 debt issuance of $7.0 billion |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 7,000,000,000 |
2018 debt issuance of $7.0 billion | Fixed-rate 1.800% – 3.750% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 7,000,000,000 | $ 7,000,000,000
Debt instrument, maturity year (calendar), start | 2019 |
Debt instrument, maturity year (calendar), end | 2047 |
2018 debt issuance of $7.0 billion | Fixed-rate 1.800% – 3.750% notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 1.80% |
Debt instrument, effective interest rate | 1.83% | 1.83%
2018 debt issuance of $7.0 billion | Fixed-rate 1.800% – 3.750% notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 3.75% |
Debt instrument, effective interest rate | 3.80% | 3.80%

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