Borrowings Commercial Paper Activity (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Jul. 01, 2017	Sep. 30, 2017	Oct. 01, 2016
Commercial Paper Rollforward [Line Items]
Beginning Balance		$ 1,521	$ 1,521	$ 2,430
Additions			6,736	4,794
Payments			(5,489)	(5,714)
Other Activity			4	11
Ending Balance			2,772	1,521
Commercial Paper with original maturities less that three months [Member]
Commercial Paper Rollforward [Line Items]
Beginning Balance		777	777	2,330
Additions	[1]		372	0
Payments	[1]		0	(1,559)
Other Activity			2	6
Ending Balance			1,151	777
commercial paper with original maturities greater than three months [Member]
Commercial Paper Rollforward [Line Items]
Beginning Balance		$ 744	744	100
Additions			6,364	4,794
Payments			(5,489)	(4,155)
Other Activity			2	5
Ending Balance			$ 1,621	$ 744
Existing Line of Credit 3
Commercial Paper Rollforward [Line Items]
Line of Credit Facility, Expiration Date			Mar. 31, 2018
Existing Line Of Credit 1 [Member]
Commercial Paper Rollforward [Line Items]
Line of Credit Facility, Expiration Date			Mar. 31, 2019
Existing Line of Credit 2 [Member]
Commercial Paper Rollforward [Line Items]
Line of Credit Facility, Expiration Date		Mar. 31, 2021

[1] Borrowings and reductions of borrowings are reported net.