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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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