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Fair Value Measurements Fair Value Measurements (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2019 | Mar. 31, 2018 | Sep. 30, 2017 | Apr. 01, 2017 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | $ 95,000,000 |  |  |  | $ 95,000,000 | $ 18,000,000 |
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 |  |  |  |  | $ 94,000,000 | $ 175,000,000 | $ 214,000,000
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 |  |  |  |  | 16.20% | 18.60% |
Prepared Foods [Member] | San Diego Prepared Foods operation [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  | 52,000,000
Property, plant, and equipment impairment |  |  |  |  |  |  | 43,000,000
Impairment of Intangible Assets, Finite-lived |  |  |  |  |  |  | 8,000,000
Impairment of other assets |  |  |  |  |  |  | 1,000,000
Prepared Foods [Member] | San Diego Prepared Foods operation [Member] | Cost of Sales [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  | 44,000,000
Prepared Foods [Member] | San Diego Prepared Foods operation [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  | 8,000,000
Fair Value, Nonrecurring [Member] | Prepared Foods [Member] | San Diego Prepared Foods operation [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | $ 52,000,000 |  |  |
Property, plant, and equipment impairment |  |  |  | 43,000,000 |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  | 8,000,000 |  |  |
Impairment of other assets |  |  |  | 1,000,000 |  |  |
Fair Value, Nonrecurring [Member] | Prepared Foods [Member] | San Diego Prepared Foods operation [Member] | Cost of Sales [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | 44,000,000 |  |  |
Fair Value, Nonrecurring [Member] | Prepared Foods [Member] | San Diego Prepared Foods operation [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | $ 8,000,000 |  |  |
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] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  | $ 75,000,000 |  |  |  |  |
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 | $ 45,000,000
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 |  |  | $ 45,000,000 |  |  | $ 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 |  |  |  |  | 41 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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