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Quarterly Financial Data (Unaudited) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Quarterly Financial Data [Line Items]
Gain on disposition of business									$ 17	$ 42	$ 0
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions									21	8	5
Asset Impairment Charges									94	175	214
Keystone Foods [Member]
Quarterly Financial Data [Line Items]
Business Acquisition, Expense from Purchase Accounting and Acquisition Related Costs				$ 26
Business Combination, Acquisition Related Costs			$ 11	15
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	$ 10	$ 15	$ 8	$ 8	$ 14	$ 14	$ 12	$ 19	$ 41	$ 59	$ 150
After Tax [Member]
Quarterly Financial Data [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		105
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability							(9)	(994)
Activity From Fire Related Damages [Domain]
Quarterly Financial Data [Line Items]
Other Nonrecurring (Income) Expense	31
Equity Securities [Member]
Quarterly Financial Data [Line Items]
Gain on Sale of Investments		$ 55
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Non-Protein Business [Member]
Quarterly Financial Data [Line Items]
Gain on disposition of business					$ 11
Asset Impairment Charges							75
Asset Impairment Charges, Net of (Gain) Loss on Disposition of Business								$ 4
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
Multiemployer Plans, Pension [Member]
Quarterly Financial Data [Line Items]
Pension Cost (Reversal of Cost)	$ 15
One Time Cash Bonus [Member]
Quarterly Financial Data [Line Items]
One-Time Cash Bonus							$ 109

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