Reconciliation of Segment Operating Income to Income before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Reconciling Items for Operating Income (Loss) from Segment to Consolidated
Segment operating income	$ 3,986	$ 3,956
Corporate and unallocated shared expenses	(150)	(132)
Restructuring and impairment charges	(15)	0
Other Income	53	0
Interest expense, net	(129)	(99)
Income before income taxes	$ 3,745	$ 3,725