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Debt - Summary of Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018
Debt Instrument [Line Items] |  |
Total term debt | $ 101,679 | $ 104,193
Unamortized premium/(discount) and issuance costs, net | (224) | (218)
Hedge accounting fair value adjustments | 612 | (1,456)
Less: Current portion of term debt | (10,260) | (8,784)
Total non-current portion of term debt | 91,807 | 93,735
2013–2018 debt issuances | Floating-rate notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 4,250 | $ 7,107
Debt instrument, maturity year (calendar), start | 2020 |
Debt instrument, maturity year (calendar), end | 2022 |
2013–2018 debt issuances | Floating-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 2.25% | 1.87%
2013–2018 debt issuances | Floating-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, effective interest rate | 3.28% | 3.44%
2013–2018 debt issuances | Fixed-rate notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 90,429 | $ 97,086
Debt instrument, maturity year (calendar), start | 2019 |
Debt instrument, maturity year (calendar), end | 2047 |
2013–2018 debt issuances | Fixed-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 0.35% |
Debt instrument, effective interest rate | 0.28% | 0.28%
2013–2018 debt issuances | Fixed-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 4.65% |
Debt instrument, effective interest rate | 4.78% | 4.78%
2019 debt issuance | Fixed-rate notes |  |
Debt Instrument [Line Items] |  |
Total term debt | $ 7,000 | $ 0
Debt instrument, maturity year (calendar), start | 2022 |
Debt instrument, maturity year (calendar), end | 2049 |
Debt instrument, effective interest rate |  | 0.00%
2019 debt issuance | Fixed-rate notes | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 1.70% |
Debt instrument, effective interest rate | 1.71% |
2019 debt issuance | Fixed-rate notes | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 2.95% |
Debt instrument, effective interest rate | 2.99% |

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