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Summary of Term Debt (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2015 | Sep. 26, 2015
Debt Instrument [Line Items] |  |
Total term debt | $ 55,548 | $ 55,701
Unamortized discount | (109) | (114)
Hedge accounting fair value adjustments | 265 | 376
Less: Current portion of long-term debt | (2,500) | (2,500)
Total long-term debt | 53,204 | 53,463
2013 debt issuance | Floating-rate notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, senior notes | $ 3,000 | $ 3,000
Debt instrument maturity year, start | 2016 | 2016
Debt instrument maturity year, end | 2018 | 2018
Debt instrument effective interest rate, minimum | 0.51% | 0.51%
Debt instrument effective interest rate, maximum | 1.10% | 1.10%
2013 debt issuance | Fixed-rate 0.45% - 3.85% notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, senior notes | $ 14,000 | $ 14,000
Debt instrument maturity year, start | 2016 | 2016
Debt instrument maturity year, end | 2043 | 2043
Debt instrument effective interest rate, minimum | 0.51% | 0.51%
Debt instrument effective interest rate, maximum | 3.91% | 3.91%
2014 debt issuance | Floating-rate notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, senior notes | $ 2,000 | $ 2,000
Debt instrument maturity year, start | 2017 | 2017
Debt instrument maturity year, end | 2019 | 2019
Debt instrument effective interest rate, minimum | 0.41% | 0.37%
Debt instrument effective interest rate, maximum | 0.64% | 0.60%
2014 debt issuance | Fixed-rate 1.05% - 4.45% notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, senior notes | $ 10,000 | $ 10,000
Debt instrument maturity year, start | 2017 | 2017
Debt instrument maturity year, end | 2044 | 2044
Debt instrument effective interest rate, minimum | 0.40% | 0.37%
Debt instrument effective interest rate, maximum | 4.48% | 4.48%
2015 debt issuances | Floating-rate notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, senior notes | $ 1,755 | $ 1,743
Debt instrument maturity year, start | 2017 | 2017
Debt instrument maturity year, end | 2020 | 2020
Debt instrument effective interest rate, minimum | 0.41% | 0.36%
Debt instrument effective interest rate, maximum | 1.87% | 1.87%
2015 debt issuances | Fixed-rate 0.35% - 4.375% notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, senior notes | $ 24,793 | $ 24,958
Debt instrument maturity year, start | 2017 | 2017
Debt instrument maturity year, end | 2045 | 2045
Debt instrument effective interest rate, minimum | 0.28% | 0.28%
Debt instrument effective interest rate, maximum | 4.51% | 4.51%

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