Restructuring And Impairment Charges (Narrative) (Details) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 01, 2016 USD ($)	Jul. 02, 2016 USD ($)	Apr. 02, 2016 USD ($)	Jan. 02, 2016 USD ($)	Sep. 26, 2015 USD ($)	Jun. 27, 2015 USD ($)	Mar. 28, 2015 USD ($)	Dec. 27, 2014 USD ($)	Oct. 01, 2016 USD ($) segment item	Sep. 26, 2015 USD ($) segment	Sep. 27, 2014 USD ($) item
Restructuring And Impairment Charges [Line Items]
Number of operating segments | segment									3	4
Number of facilities intended to shut down | item									2		4
Net sales	$ 1,618	$ 1,645	$ 1,614	$ 1,612	$ 1,196	$ 1,241	$ 1,224	$ 1,220	$ 6,489	$ 4,881	$ 4,958
Expected total cost	78								78
To be Recognized in Future	$ 3								$ 3
Consumer Packaging [Member]
Restructuring And Impairment Charges [Line Items]
Number of facilities closed | item									1
Number of facilities intended to shut down | item									1
Net sales									$ 2,768	2,870	2,904
Engineered Materials [Member]
Restructuring And Impairment Charges [Line Items]
Net sales									1,462	1,509	1,604
Consumer Packaging And Engineered Materials [Member]
Restructuring And Impairment Charges [Line Items]
Net sales									$ 36
Consumer Packaging Affected By Closures [Member]
Restructuring And Impairment Charges [Line Items]
Net sales										24	153
Engineered Materials Affected By Closures [Member]
Restructuring And Impairment Charges [Line Items]
Net sales										$ 16	$ 9