Summary of Term Debt (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Mar. 26, 2016	Sep. 26, 2015
Debt Instrument [Line Items]
Total term debt	$ 71,344	$ 55,701
Unamortized premium/(discount)	15	(114)
Hedge accounting fair value adjustments	515	376
Less: Current portion of long-term debt	(2,500)	(2,500)
Total long-term debt	69,374	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	0.69%	0.37%
Debt instrument effective interest rate, maximum	0.92%	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	0.69%	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	$ 1,781	$ 1,743
Debt instrument maturity year, start	2017	2017
Debt instrument maturity year, end	2020	2020
Debt instrument effective interest rate, minimum	0.67%	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	$ 25,063	$ 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%
Second quarter 2016 debt issuance
Debt Instrument [Line Items]
Debt instrument, senior notes	$ 15,500	$ 0
Second quarter 2016 debt issuance \| Floating-rate notes due 2019
Debt Instrument [Line Items]
Debt instrument, senior notes	$ 500	$ 0
Debt instrument maturity year	2019	2019
Debt instrument effective interest rate	1.44%	0.00%
Second quarter 2016 debt issuance \| Floating-rate notes due 2021
Debt Instrument [Line Items]
Debt instrument, senior notes	$ 500	$ 0
Debt instrument maturity year	2021	2021
Debt instrument effective interest rate	1.75%	0.00%
Second quarter 2016 debt issuance \| Fixed-rate 1.30% notes
Debt Instrument [Line Items]
Debt instrument, senior notes	$ 500	$ 0
Debt instrument maturity year	2018	2018
Debt instrument effective interest rate	1.32%	0.00%
Second quarter 2016 debt issuance \| Fixed-rate 1.70% notes
Debt Instrument [Line Items]
Debt instrument, senior notes	$ 1,000	$ 0
Debt instrument maturity year	2019	2019
Debt instrument effective interest rate	1.71%	0.00%
Second quarter 2016 debt issuance \| Fixed-rate 2.25% notes
Debt Instrument [Line Items]
Debt instrument, senior notes	$ 3,000	$ 0
Debt instrument maturity year	2021	2021
Debt instrument effective interest rate	1.80%	0.00%
Second quarter 2016 debt issuance \| Fixed-rate 2.85% notes
Debt Instrument [Line Items]
Debt instrument, senior notes	$ 1,500	$ 0
Debt instrument maturity year	2023	2023
Debt instrument effective interest rate	2.48%	0.00%
Second quarter 2016 debt issuance \| Fixed-rate 3.25% notes
Debt Instrument [Line Items]
Debt instrument, senior notes	$ 3,250	$ 0
Debt instrument maturity year	2026	2026
Debt instrument effective interest rate	2.33%	0.00%
Second quarter 2016 debt issuance \| Fixed-rate 4.50% notes
Debt Instrument [Line Items]
Debt instrument, senior notes	$ 1,250	$ 0
Debt instrument maturity year	2036	2036
Debt instrument effective interest rate	4.54%	0.00%
Second quarter 2016 debt issuance \| Fixed-rate 4.65% notes
Debt Instrument [Line Items]
Debt instrument, senior notes	$ 4,000	$ 0
Debt instrument maturity year	2046	2046
Debt instrument effective interest rate	4.58%	0.00%

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Amount as of the balance sheet date of the adjustment to the carrying value of an interest bearing hedged item made under an interest rate fair value hedge.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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