Segment and Geographic Data, Selected Information by Reportable Segment (Details) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 26, 2020 USD ($)	Jun. 27, 2020 USD ($)	Mar. 28, 2020 USD ($)	Dec. 28, 2019 USD ($)	Sep. 28, 2019 USD ($)	Jun. 29, 2019 USD ($)	Mar. 30, 2019 USD ($)	Dec. 29, 2018 USD ($)	Sep. 26, 2020 USD ($) Segment	Sep. 28, 2019 USD ($)	Sep. 29, 2018 USD ($)
Segment and Geographic Data [Abstract]
Number of reporting segments | Segment									4
Selected Information by Reportable Segment [Abstract]
Net sales	$ 3,008	$ 2,910	$ 2,975	$ 2,816	$ 3,019	$ 1,937	$ 1,950	$ 1,972	$ 11,709	$ 8,878	$ 7,869
Operating income									1,179	974	761
Depreciation and amortization									845	613	538
Total assets	16,701				16,469				16,701	16,469
Consumer Packaging North America [Member]
Selected Information by Reportable Segment [Abstract]
Net sales											15
Engineered Materials [Member]
Selected Information by Reportable Segment [Abstract]
Net sales											10
Health, Hygiene & Specialties [Member]
Selected Information by Reportable Segment [Abstract]
Net sales											30
Operating Segment [Member] | Consumer Packaging International [Member]
Selected Information by Reportable Segment [Abstract]
Net sales									4,195	1,229	215
Operating income									299	12	17
Depreciation and amortization									318	93	15
Total assets	7,575				7,085				7,575	7,085
Operating Segment [Member] | Consumer Packaging North America [Member]
Selected Information by Reportable Segment [Abstract]
Net sales									2,850	2,636	2,463
Operating income									320	234	190
Depreciation and amortization									250	216	229
Total assets	3,716				4,243				3,716	4,243
Operating Segment [Member] | Engineered Materials [Member]
Selected Information by Reportable Segment [Abstract]
Net sales									2,334	2,538	2,633
Operating income									317	318	365
Depreciation and amortization									105	116	108
Total assets	2,006				1,862				2,006	1,862
Operating Segment [Member] | Health, Hygiene & Specialties [Member]
Selected Information by Reportable Segment [Abstract]
Net sales									2,330	2,475	2,558
Operating income									243	410	189
Depreciation and amortization									172	188	$ 186
Total assets	$ 3,404				$ 3,279				$ 3,404	$ 3,279