Debt (Narrative) (Details) - USD ($) $ in Millions		6 Months Ended
	Apr. 01, 2020	Mar. 28, 2020	Mar. 30, 2019	Sep. 28, 2019
Debt Instrument [Line Items]
Repayments of Commercial Paper		$ 12,885	$ 10,567
Repayments of Long-term Lines of Credit		1,080	$ 335
Debt Instrument, Unamortized Discount		46		$ 48
Term Loan Facility Due March 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount		1,500
Long-term Debt, Gross		$ 0		0
Debt Instrument, Interest Rate, Stated Percentage		2.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,750
Amount available for borrowing under credit facility		1,550
Revolving credit facility		200		70
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		0
Bilateral Letters Of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		119
Commercial paper
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,000
Commercial paper				$ 1,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.07%
Debt Instrument, Term		15 days
Long-term Commercial Paper, Noncurrent		$ 1,000
Subsequent Event [Member] | Term Loan Facility Due March 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,500
Subsequent Event [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of Long-term Lines of Credit	200
Subsequent Event [Member] | Commercial paper
Debt Instrument [Line Items]
Repayments of Commercial Paper	$ 1,000