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Debt (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
Debt (Narrative) (Details) - USD ($)	Jun. 30, 2018	Dec. 30, 2017	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,500,000,000.0		$ 1,750,000,000.00
Amount available for borrowing under credit facility	$ 1,720,000,000.00		$ 1,720,000,000.00
Commercial paper
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	1,000,000,000		1,000,000,000
Commercial paper	$ 1,000,000,000		$ 1,000,000,000		$ 778,000,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time	2.31%		2.31%
Debt Instrument, Term			50 days
7.00% Notes due May 2018
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 0		$ 0		120,000,000
Repayments of Long-term Debt	120,000,000
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	0		0
Bilateral Letters Of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	105,000,000		105,000,000
Term Loan [Member] \| Tranche B due August 2020 (2.93% at 6/30/2018)
Debt Instrument [Line Items]
Long-term Debt, Gross	750,000,000		750,000,000		500,000,000
Term Loan [Member] \| Tranche B due August 2019
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 0		$ 0		$ 427,000,000
Repayments of Long-term Debt		$ 427,000,000