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Fair Value Measurements Fair Value Measurements (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Oct. 03, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | $ 16,000,000 | $ 95,000,000 |
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings | 0 | 0 |
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale | 0 |  |
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent | 0 | 0 |
Asset Impairment Charges | $ 48,000,000 | $ 94,000,000 | $ 175,000,000
Wal-Mart Stores, Inc. [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Concentration, Percentage | 16.50% | 16.20% |
Prepared Foods business [Member] | Prepared Foods [Member] | Cost of Sales [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset Impairment Charges |  | $ 41,000,000 |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Non-Protein Business [Member] | Prepared Foods [Member] | Cost of Sales [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset Impairment Charges |  |  | 101,000,000
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Non-Protein Business [Member] | Fair Value, Nonrecurring [Member] | Cost of Sales [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset Impairment Charges |  |  | $ 101,000,000
Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Short Term Investment Maturity Period | 12 months |  |
Available For Sale Securities Debt Maturity Period | 40 years |  |
Maximum [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Concentration, Percentage | 10.00% | 10.00% |

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