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Quarterly Financial Data (Unaudited) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 03, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Quarterly Financial Data [Line Items]
Restructuring and Related Cost, Incurred Cost									$ 77	$ 41	$ 59
Pretax Income from 53 week accounting cycle	$ 65
Asset Impairment Charges									48	94	175
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions									5	$ 21	$ 8
Activity From Fire Related Damages [Domain]
Quarterly Financial Data [Line Items]
Other Nonrecurring (Income) Expense		$ 15		$ 16	$ 31
After Tax [Member]
Quarterly Financial Data [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions						$ 105
Equity Securities [Member]
Quarterly Financial Data [Line Items]
Gain on Sale of Investments						55
Pension Plan [Member]
Quarterly Financial Data [Line Items]
Defined Benefit Plan, Gain from Providing Special and Contractual Termination Benefits		$ 6	$ 110						$ 112
Pension Cost (Reversal of Cost)					15
Keystone Foods [Member]
Quarterly Financial Data [Line Items]
Business Combination, Acquisition Related Costs							$ 11	$ 15
Business Acquisition, Expense from Purchase Accounting and Acquisition Related Costs								26
Fair Value Adjustment to Inventory [Member] | Keystone Foods [Member]
Quarterly Financial Data [Line Items]
Business Acquisition, Fair Value Inventory Adjustment								11
Financial Fitness Program [Member]
Quarterly Financial Data [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 23			$ 52	10	$ 15	$ 8	$ 8
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Keystone Further Processing Facility [Member]
Quarterly Financial Data [Line Items]
Asset Impairment Charges					$ 41

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