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Fair Value Measurements Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017	Apr. 01, 2017	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net				$ 0	$ 0
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent				0	0
Asset Impairment Charges				$ 175	$ 214	$ 45
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				18.60%	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
Property, plant, and equipment impairment			43
Impairment of Intangible Assets, Finite-lived			8
Impairment of other assets			1
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
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
Fair Value, Measurements, 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
Property, plant, and equipment impairment			43
Impairment of Intangible Assets, Finite-lived			8
Impairment of other assets			1
Fair Value, Measurements, 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
Fair Value, Measurements, 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
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	$ 45
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	$ 45
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Non-Protein Business [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost of Sales [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		$ 45		$ 101
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				32 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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