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Debt (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended
Debt (Narrative) (Details) - USD ($) $ in Millions	Nov. 29, 2018	Dec. 29, 2018	Sep. 29, 2018
364-Day due November 2019 [Member] [Domain]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 1,800
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		1,750
Amount available for borrowing under credit facility		1,750
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		111
Commercial paper
Debt Instrument [Line Items]
Maximum borrowing capacity		1,000
Commercial paper		$ 737	$ 605
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.94%
Debt Instrument, Term		15 days
Term Loan [Member] \| 364-Day due November 2019 [Member] [Domain]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,800		$ 0
Debt Instrument, Basis Spread on Variable Rate	1.125%