Restructuring and Asset Impairment Charges, Net (Details 4) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 25, 2016	Mar. 27, 2015	Mar. 25, 2016	Mar. 27, 2015	Sep. 25, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 125		$ 125		$ 155
Accrued and Other Current Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	111		111		140
Other Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	14		14		15
2014 and prior actions
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	32		32		$ 38
Charges		$ 3	1	$ 12
Utilization	4	13	10	29
Selling, General and Administrative [Member] | Repositioning actions
Restructuring Cost and Reserve [Line Items]
Repositioning charges related to professional fees	$ 5	$ 17	$ 11	$ 34