Reconciliation of Segment Operating Income to Income before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Reconciling Items for Operating Income (Loss) from Segment to Consolidated
Segment operating income	$ 4,193	$ 4,011	$ 12,416	$ 11,963
Corporate and unallocated shared expenses	(196)	(99)	(540)	(392)
Restructuring and impairment charges	0	0	(28)	0
Other income/(expense), net	0	(177)	94	(177)
Interest expense, net	(143)	(117)	(415)	(300)
Income before income taxes	$ 3,854	$ 3,618	$ 11,527	$ 11,094