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%

Latest year the outstanding debt instruments are required to be repaid.

No definition available.

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- Definition

Earliest year the outstanding debt instruments are required to be repaid.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
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- Definition

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.

+ References

No definition available.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts 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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