Commitments (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Apr. 01, 2017	Oct. 01, 2016
Guarantor Obligations [Line Items]
Potential maximum obligation under cash flow assistance programs	$ 380
Total receivables under cash flow assistance programs	5	$ 2
Uncollectible receivables estimated under cash flow assistance programs	0	0
Guarantor Obligations, Current Carrying Value	0	$ 0
Industrial Revenue Bonds [Member]
Guarantor Obligations [Line Items]
Industrial Revenue Bonds	$ 505
Guarantee of Indebtedness of Others [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Period (in years)	10 years
Maximum potential amount	$ 32
Residual Value Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential amount	$ 92
Guarantor Obligations, Maximum Exposure, Remaining Lease Period (in years)	10 years
Amount recoverable through various recourse provisions	$ 84