Discontinued Operations (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended							12 Months Ended
	Jul. 31, 2016	Oct. 31, 2015	Jun. 24, 2016	Mar. 25, 2016	Dec. 25, 2015	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Divestiture of business
Net sales from discontinued operations											$ 1,595	$ 1,939
Pre-tax income from discontinued operations										$ 30	118	224
Pre-tax gain on sale of discontinued operations										29	1,105
Income tax (expense) benefit										9	(41)	(57)
Income from discontinued operations, net of income taxes			$ 48	$ (9)	$ 29	$ 904	$ (42)	$ 283	$ 37	68	1,182	$ 167
Net proceeds from divestiture of discontinued operations										(19)	2,957
Com-Net
Divestiture of business
Loss Contingency, purchase price plus interest and costs		$ 127
Loss contingency, amount paid to sellers	$ 96
Loss Contingency Accrual, Provision										$ (30)	$ 127