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Debt - Summary of Term Debt (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2017 CAD | Sep. 30, 2017 EUR (€) | Sep. 24, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 104,021,000,000 |  |  | $ 78,384,000,000
Unamortized premium/(discount) and issuance costs, net | (225,000,000) |  |  | (174,000,000)
Hedge accounting fair value adjustments | (93,000,000) |  |  | 717,000,000
Less: Current portion of long-term debt | (6,496,000,000) |  |  | (3,500,000,000)
Total long-term debt | 97,207,000,000 |  |  | 75,427,000,000
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% | 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% | 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% | 1.00% | 1.00% |
Debt instrument, effective interest rate | 1.08% | 1.08% | 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% | 3.85% | 3.85% |
Debt instrument, effective interest rate | 3.91% | 3.91% | 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 |  |  | $ 2,000,000,000
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 | 1.61% | 1.61% | 1.61% | 0.86%
2014 debt issuance of $12.0 billion | Floating-rate notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, effective interest rate | 1.61% | 1.61% | 1.61% | 1.09%
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 |  |  | $ 10,000,000,000
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% | 2.10% | 2.10% |
Debt instrument, effective interest rate | 1.61% | 1.61% | 1.61% | 0.85%
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% | 4.45% | 4.45% |
Debt instrument, effective interest rate | 4.48% | 4.48% | 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 | $ 1,549,000,000 |  |  | $ 1,781,000,000
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 | 1.56% | 1.56% | 1.56% | 0.87%
2015 debt issuances of $27.3 billion | Floating-rate notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, effective interest rate | 1.87% | 1.87% | 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 | $ 24,522,000,000 |  |  | $ 25,144,000,000
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% | 0.35% | 0.35% |
Debt instrument, effective interest rate | 0.28% | 0.28% | 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% | 4.375% | 4.375% |
Debt instrument, effective interest rate | 4.51% | 4.51% | 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 | 1.45% | 1.45% | 1.45% | 0.91%
2016 debt issuances of $24.9 billion | Floating-rate notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, effective interest rate | 2.44% | 2.44% | 2.44% | 1.95%
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 23,645,000,000 |  |  | $ 23,609,000,000
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% | 1.10% | 1.10% |
Debt instrument, effective interest rate | 1.13% | 1.13% | 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% | 4.65% | 4.65% |
Debt instrument, effective interest rate | 4.78% | 4.78% | 4.78% | 4.58%
Second quarter 2017 debt issuance of $10.0 billion |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ 10,000,000,000 |  |  |
Second quarter 2017 debt issuance of $10.0 billion | Floating-rate notes due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 500,000,000 |  |  | $ 0
Debt instrument, maturity year | 2019 |  |  |
Debt instrument, effective interest rate | 1.39% | 1.39% | 1.39% | 0.00%
Second quarter 2017 debt issuance of $10.0 billion | Floating-rate notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 500,000,000 |  |  | $ 0
Debt instrument, maturity year | 2020 |  |  |
Debt instrument, effective interest rate | 1.51% | 1.51% | 1.51% | 0.00%
Second quarter 2017 debt issuance of $10.0 billion | Floating-rate notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2022 |  |  |
Debt instrument, effective interest rate | 1.81% | 1.81% | 1.81% | 0.00%
Second quarter 2017 debt issuance of $10.0 billion | Fixed-rate 1.550% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 500,000,000 |  |  | $ 0
Debt instrument, maturity year | 2019 |  |  |
Debt instrument, stated interest rate | 1.55% | 1.55% | 1.55% |
Debt instrument, effective interest rate | 1.59% | 1.59% | 1.59% | 0.00%
Second quarter 2017 debt issuance of $10.0 billion | Fixed-rate 1.900% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2020 |  |  |
Debt instrument, stated interest rate | 1.90% | 1.90% | 1.90% |
Debt instrument, effective interest rate | 1.51% | 1.51% | 1.51% | 0.00%
Second quarter 2017 debt issuance of $10.0 billion | Fixed-rate 2.500% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,500,000,000 |  |  | $ 0
Debt instrument, maturity year | 2022 |  |  |
Debt instrument, stated interest rate | 2.50% | 2.50% | 2.50% |
Debt instrument, effective interest rate | 1.80% | 1.80% | 1.80% | 0.00%
Second quarter 2017 debt issuance of $10.0 billion | Fixed-rate 3.000% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,750,000,000 |  |  | $ 0
Debt instrument, maturity year | 2024 |  |  |
Debt instrument, stated interest rate | 3.00% | 3.00% | 3.00% |
Debt instrument, effective interest rate | 2.11% | 2.11% | 2.11% | 0.00%
Second quarter 2017 debt issuance of $10.0 billion | Fixed-rate 3.350% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 2,250,000,000 |  |  | $ 0
Debt instrument, maturity year | 2027 |  |  |
Debt instrument, stated interest rate | 3.35% | 3.35% | 3.35% |
Debt instrument, effective interest rate | 2.25% | 2.25% | 2.25% | 0.00%
Second quarter 2017 debt issuance of $10.0 billion | Fixed-rate 4.250% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2047 |  |  |
Debt instrument, stated interest rate | 4.25% | 4.25% | 4.25% |
Debt instrument, effective interest rate | 4.26% | 4.26% | 4.26% | 0.00%
Second quarter 2017 debt issuance of $1.0 billion |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ 1,000,000,000 |  |  |
Second quarter 2017 debt issuance of $1.0 billion | Fixed-rate 4.300% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2047 |  |  |
Debt instrument, stated interest rate | 4.30% | 4.30% | 4.30% |
Debt instrument, effective interest rate | 4.30% | 4.30% | 4.30% | 0.00%
Third quarter 2017 debt issuance of $7.0 billion |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ 7,000,000,000 |  |  |
Third quarter 2017 debt issuance of $7.0 billion | Floating-rate notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 500,000,000 |  |  | $ 0
Debt instrument, maturity year | 2020 |  |  |
Debt instrument, effective interest rate | 1.38% | 1.38% | 1.38% | 0.00%
Third quarter 2017 debt issuance of $7.0 billion | Floating-rate notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 750,000,000 |  |  | $ 0
Debt instrument, maturity year | 2022 |  |  |
Debt instrument, effective interest rate | 1.66% | 1.66% | 1.66% | 0.00%
Third quarter 2017 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 | 2020 |  |  |
Debt instrument, stated interest rate | 1.80% | 1.80% | 1.80% |
Debt instrument, effective interest rate | 1.84% | 1.84% | 1.84% | 0.00%
Third quarter 2017 debt issuance of $7.0 billion | Fixed-rate 2.300% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2022 |  |  |
Debt instrument, stated interest rate | 2.30% | 2.30% | 2.30% |
Debt instrument, effective interest rate | 2.34% | 2.34% | 2.34% | 0.00%
Third quarter 2017 debt issuance of $7.0 billion | Fixed-rate 2.850% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,750,000,000 |  |  | $ 0
Debt instrument, maturity year | 2024 |  |  |
Debt instrument, stated interest rate | 2.85% | 2.85% | 2.85% |
Debt instrument, effective interest rate | 2.25% | 2.25% | 2.25% | 0.00%
Third quarter 2017 debt issuance of $7.0 billion | Fixed-rate 3.200% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 2,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2027 |  |  |
Debt instrument, stated interest rate | 3.20% | 3.20% | 3.20% |
Debt instrument, effective interest rate | 2.43% | 2.43% | 2.43% | 0.00%
Third quarter 2017 euro-denominated debt issuance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | € |  |  | € 2,500,000,000.0 |
Third quarter 2017 euro-denominated debt issuance | Fixed-rate 0.875% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,469,000,000 |  |  | $ 0
Debt instrument, maturity year | 2025 |  |  |
Debt instrument, stated interest rate | 0.875% | 0.875% | 0.875% |
Debt instrument, effective interest rate | 3.03% | 3.03% | 3.03% | 0.00%
Third quarter 2017 euro-denominated debt issuance | Fixed-rate 1.375% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,469,000,000 |  |  | $ 0
Debt instrument, maturity year | 2029 |  |  |
Debt instrument, stated interest rate | 1.375% | 1.375% | 1.375% |
Debt instrument, effective interest rate | 3.37% | 3.37% | 3.37% | 0.00%
Third quarter 2017 debt issuance of $1.0 billion |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ 1,000,000,000 |  |  |
Third quarter 2017 debt issuance of $1.0 billion | Fixed-rate 3.000% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2027 |  |  |
Debt instrument, stated interest rate | 3.00% | 3.00% | 3.00% |
Debt instrument, effective interest rate | 3.03% | 3.03% | 3.03% | 0.00%
Fourth quarter 2017 Canadian dollar-denominated debt issuance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | CAD |  | CAD 2,500,000,000.0 |  |
Fourth quarter 2017 Canadian dollar-denominated debt issuance | Fixed-rate 2.513% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 2,017,000,000 |  |  | $ 0
Debt instrument, maturity year | 2024 |  |  |
Debt instrument, stated interest rate | 2.513% | 2.513% | 2.513% |
Debt instrument, effective interest rate | 2.66% | 2.66% | 2.66% | 0.00%
Fourth quarter 2017 debt issuance of $5.0 billion |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ 5,000,000,000 |  |  |
Fourth quarter 2017 debt issuance of $5.0 billion | Fixed-rate 1.500% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2019 |  |  |
Debt instrument, stated interest rate | 1.50% | 1.50% | 1.50% |
Debt instrument, effective interest rate | 1.54% | 1.54% | 1.54% | 0.00%
Fourth quarter 2017 debt issuance of $5.0 billion | Fixed-rate 2.100% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2022 |  |  |
Debt instrument, stated interest rate | 2.10% | 2.10% | 2.10% |
Debt instrument, effective interest rate | 1.92% | 1.92% | 1.92% | 0.00%
Fourth quarter 2017 debt issuance of $5.0 billion | Fixed-rate 2.900% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 2,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2027 |  |  |
Debt instrument, stated interest rate | 2.90% | 2.90% | 2.90% |
Debt instrument, effective interest rate | 2.55% | 2.55% | 2.55% | 0.00%
Fourth quarter 2017 debt issuance of $5.0 billion | Fixed-rate 3.750% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total term debt | $ 1,000,000,000 |  |  | $ 0
Debt instrument, maturity year | 2047 |  |  |
Debt instrument, stated interest rate | 3.75% | 3.75% | 3.75% |
Debt instrument, effective interest rate | 3.78% | 3.78% | 3.78% | 0.00%

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