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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 |  |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  |  |  |  |  |  |  |  | 5 | 21 | 8
Asset Impairment Charges |  |  |  |  |  |  |  |  | 48 | $ 94 | $ 175
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 | $ 23 |  |  | $ 52 | $ 10 | $ 15 | $ 8 | $ 8 |  |  |
After Tax [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  |  |  |  |  | 105 |  |  |  |  |
Activity From Fire Related Damages [Domain] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Nonrecurring (Income) Expense |  | $ 15 |  | $ 16 | 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] | Keystone Further Processing Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | 41 |  |  |  |  |  |
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) |  |  |  |  |  |

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