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Debt - Summary of Term Debt (Detail) $ in Millions, AUD in Billions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 25, 2016 USD ($) | Sep. 26, 2015 USD ($) | Jun. 25, 2016 AUD | Mar. 26, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Total borrowings | $ 71,565 | $ 55,701 |  |
Unamortized premium/(discount) | 14 | (114) |  |
Hedge accounting fair value adjustments | 860 | 376 |  |
Less: Current portion of long-term debt | (3,500) | (2,500) |  |
Total long-term debt | 68,939 | 53,463 |  |
2013 debt issuance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | 17,000 | 17,000 |  |
2013 debt issuance | Floating-rate notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 2,000 | $ 3,000 |  |
Debt instrument maturity year, start | 2018 | 2016 |  |
Debt instrument maturity year, end | 2018 | 2018 |  |
Debt instrument effective interest rate, minimum | 1.10% | 0.51% |  |
Debt instrument, effective interest rate, maximum | 1.10% | 1.10% |  |
2013 debt issuance | Fixed-rate 1.00% - 3.85% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 12,500 | $ 14,000 |  |
Debt instrument maturity year, start | 2018 | 2016 |  |
Debt instrument maturity year, end | 2043 | 2043 |  |
Debt instrument effective interest rate, minimum | 1.08% | 0.51% |  |
Debt instrument, effective interest rate, maximum | 3.91% | 3.91% |  |
Debt instrument interest rate, minimum | 1.00% | 0.45% |  |
Debt instrument interest rate, maximum | 3.85% | 3.85% |  |
2014 debt issuance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ 12,000 | $ 12,000 |  |
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 | 0.70% | 0.37% |  |
Debt instrument, effective interest rate, maximum | 0.93% | 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 | 0.70% | 0.37% |  |
Debt instrument, effective interest rate, maximum | 4.48% | 4.48% |  |
Debt instrument interest rate, minimum | 1.05% | 1.05% |  |
Debt instrument interest rate, maximum | 4.45% | 4.45% |  |
2015 debt issuance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ 27,300 | $ 27,300 |  |
2015 debt issuance | Floating-rate notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 1,774 | $ 1,743 |  |
Debt instrument maturity year, start | 2017 | 2017 |  |
Debt instrument maturity year, end | 2020 | 2020 |  |
Debt instrument effective interest rate, minimum | 0.68% | 0.36% |  |
Debt instrument, effective interest rate, maximum | 1.87% | 1.87% |  |
2015 debt issuance | Fixed-rate 0.35% - 4.375% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 25,347 | $ 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% |  |
Debt instrument interest rate, minimum | 0.35% | 0.35% |  |
Debt instrument interest rate, maximum | 4.375% | 4.375% |  |
Second quarter 2016 debt issuance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ 15,500 |  |  | $ 15,500
Second quarter 2016 debt issuance | Floating Rate Notes Due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 500 |  |  |
Debt instrument maturity year | 2019 |  |  |
Debt instrument effective interest rate | 1.47% |  | 1.47% |
Second quarter 2016 debt issuance | Floating Rate Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 500 |  |  |
Debt instrument maturity year | 2021 |  |  |
Debt instrument effective interest rate | 1.78% |  | 1.78% |
Second quarter 2016 debt issuance | Fixed-rate 1.30% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 500 |  |  |
Debt instrument maturity year | 2018 |  |  |
Debt instrument effective interest rate | 1.32% |  | 1.32% |
Debt instrument interest rate | 1.30% |  | 1.30% |
Second quarter 2016 debt issuance | Fixed-rate 1.70% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 1,000 |  |  |
Debt instrument maturity year | 2019 |  |  |
Debt instrument effective interest rate | 1.71% |  | 1.71% |
Debt instrument interest rate | 1.70% |  | 1.70% |
Second quarter 2016 debt issuance | Fixed-rate 2.25% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 3,000 |  |  |
Debt instrument maturity year | 2021 |  |  |
Debt instrument effective interest rate | 1.80% |  | 1.80% |
Debt instrument interest rate | 2.25% |  | 2.25% |
Second quarter 2016 debt issuance | Fixed-rate 2.85% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 1,500 |  |  |
Debt instrument maturity year | 2023 |  |  |
Debt instrument effective interest rate | 2.50% |  | 2.50% |
Debt instrument interest rate | 2.85% |  | 2.85% |
Second quarter 2016 debt issuance | Fixed-rate 3.25% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 3,250 |  |  |
Debt instrument maturity year | 2026 |  |  |
Debt instrument effective interest rate | 2.40% |  | 2.40% |
Debt instrument interest rate | 3.25% |  | 3.25% |
Second quarter 2016 debt issuance | Fixed-rate 4.50% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 1,250 |  |  |
Debt instrument maturity year | 2036 |  |  |
Debt instrument effective interest rate | 4.54% |  | 4.54% |
Debt instrument interest rate | 4.50% |  | 4.50% |
Second quarter 2016 debt issuance | Fixed-rate 4.65% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 4,000 |  |  |
Debt instrument maturity year | 2046 |  |  |
Debt instrument effective interest rate | 4.58% |  | 4.58% |
Debt instrument interest rate | 4.65% |  | 4.65% |
Third quarter 2016 Australian dollar denominated debt issuance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | AUD |  |  | AUD 1.4 |
Third quarter 2016 Australian dollar denominated debt issuance | Fixed-rate 2.65% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 487 |  |  |
Debt instrument maturity year | 2020 |  |  |
Debt instrument effective interest rate | 1.92% |  | 1.92% |
Debt instrument interest rate | 2.65% |  | 2.65% |
Third quarter 2016 Australian dollar denominated debt issuance | Fixed-rate 3.35% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 337 |  |  |
Debt instrument maturity year | 2024 |  |  |
Debt instrument effective interest rate | 2.61% |  | 2.61% |
Debt instrument interest rate | 3.35% |  | 3.35% |
Third quarter 2016 Australian dollar denominated debt issuance | Fixed-rate 3.60% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 243 |  |  |
Debt instrument maturity year | 2026 |  |  |
Debt instrument effective interest rate | 2.84% |  | 2.84% |
Debt instrument interest rate | 3.60% |  | 3.60% |
Third quarter 2016 debt issuance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | $ 1,400 |  |  |
Third quarter 2016 debt issuance | Fixed-rate 4.15% notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, senior notes | $ 1,377 |  |  |
Debt instrument maturity year | 2046 |  |  |
Debt instrument effective interest rate | 4.15% |  | 4.15% |
Debt instrument, face amount | $ 1,400 |  |  |
Debt instrument interest rate | 4.15% |  | 4.15% |

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