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Debt - Summary of Term Debt (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 30, 2017 | Sep. 30, 2017
Debt Instrument [Line Items] |  |
Total term debt | $ 111,033,000,000 | $ 104,021,000,000
Unamortized premium/(discount) and issuance costs, net | (246,000,000) | (225,000,000)
Hedge accounting fair value adjustments | (367,000,000) | (93,000,000)
Less: Current portion of long-term debt | (6,498,000,000) | (6,496,000,000)
Total long-term debt | 103,922,000,000 | 97,207,000,000
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 | Floating-rate notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 2,000,000,000 | $ 2,000,000,000
Debt instrument, maturity year, start | 2018 |
Debt instrument, maturity year, end | 2018 |
2013 debt issuance of $17.0 billion | Floating-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 1.10% | 1.10%
2013 debt issuance of $17.0 billion | Floating-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 1.10% | 1.10%
2013 debt issuance of $17.0 billion | Fixed-rate 1.000% – 3.850% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 12,500,000,000 | $ 12,500,000,000
Debt instrument, maturity year, start | 2018 |
Debt instrument, maturity year, end | 2043 |
2013 debt issuance of $17.0 billion | Fixed-rate 1.000% – 3.850% notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 1.00% |
Debt instrument, effective interest rate | 1.08% | 1.08%
2013 debt issuance of $17.0 billion | Fixed-rate 1.000% – 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 | $ 1,000,000,000 | $ 1,000,000,000
Debt instrument, maturity year, start | 2019 |
Debt instrument, maturity year, end | 2019 |
2014 debt issuance of $12.0 billion | Floating-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 1.69% | 1.61%
2014 debt issuance of $12.0 billion | Floating-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 1.69% | 1.61%
2014 debt issuance of $12.0 billion | Fixed-rate 2.100% – 4.450% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 8,500,000,000 | $ 8,500,000,000
Debt instrument, maturity year, start | 2019 |
Debt instrument, maturity year, end | 2044 |
2014 debt issuance of $12.0 billion | Fixed-rate 2.100% – 4.450% notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 2.10% |
Debt instrument, effective interest rate | 1.69% | 1.61%
2014 debt issuance of $12.0 billion | Fixed-rate 2.100% – 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 | $ 1,544,000,000 | $ 1,549,000,000
Debt instrument, maturity year, start | 2019 |
Debt instrument, maturity year, end | 2020 |
2015 debt issuances of $27.3 billion | Floating-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 1.65% | 1.56%
2015 debt issuances of $27.3 billion | Floating-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 1.87% | 1.87%
2015 debt issuances of $27.3 billion | Fixed-rate 0.350% – 4.375% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 24,555,000,000 | $ 24,522,000,000
Debt instrument, maturity year, start | 2019 |
Debt instrument, maturity year, 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 | $ 1,350,000,000 | $ 1,350,000,000
Debt instrument, maturity year, start | 2019 |
Debt instrument, maturity year, end | 2021 |
2016 debt issuances of $24.9 billion | Floating-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 1.53% | 1.45%
2016 debt issuances of $24.9 billion | Floating-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 2.59% | 2.44%
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 23,635,000,000 | $ 23,645,000,000
Debt instrument, maturity year, start | 2018 |
Debt instrument, maturity year, 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 | $ 3,250,000,000 | $ 3,250,000,000
Debt instrument, maturity year, start | 2019 |
Debt instrument, maturity year, end | 2022 |
2017 debt issuances of $28.7 billion | Floating-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 1.48% | 1.38%
2017 debt issuances of $28.7 billion | Floating-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 1.90% | 1.81%
2017 debt issuances of $28.7 billion | Fixed-rate 0.875% – 4.300% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 25,699,000,000 | $ 25,705,000,000
Debt instrument, maturity year, start | 2019 |
Debt instrument, maturity year, 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% | 1.51%
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%
First quarter 2018 debt issuance of $7.0 billion |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 7,000,000,000 |
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 1.800% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 1,000,000,000 | $ 0
Debt instrument, maturity year | 2019 |
Debt instrument, stated interest rate | 1.80% |
Debt instrument, effective interest rate | 1.83% | 0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 2.000% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 1,000,000,000 | $ 0
Debt instrument, maturity year | 2020 |
Debt instrument, stated interest rate | 2.00% |
Debt instrument, effective interest rate | 2.03% | 0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 2.400% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 750,000,000 | $ 0
Debt instrument, maturity year | 2023 |
Debt instrument, stated interest rate | 2.40% |
Debt instrument, effective interest rate | 1.93% | 0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 2.750% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 1,500,000,000 | $ 0
Debt instrument, maturity year | 2025 |
Debt instrument, stated interest rate | 2.75% |
Debt instrument, effective interest rate | 2.77% | 0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 3.000% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 1,500,000,000 | $ 0
Debt instrument, maturity year | 2027 |
Debt instrument, stated interest rate | 3.00% |
Debt instrument, effective interest rate | 2.13% | 0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 3.750% notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 1,250,000,000 | $ 0
Debt instrument, maturity year | 2047 |
Debt instrument, stated interest rate | 3.75% |
Debt instrument, effective interest rate | 3.80% | 0.00%

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