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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) (USD $) In Millions, unless otherwise specified | Dec. 27, 2014 | Sep. 27, 2014
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U.S. Treasury and Agency [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Unrealized Gain/(Loss) | $ 1 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |  | $ 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Amortized Cost Basis | 29 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |  | 25 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Fair Value | 30 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |  | 25 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Corporate And Asset-Backed [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Unrealized Gain/(Loss) | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CorporateAndAssetBackedMember |  | 2 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CorporateAndAssetBackedMember |
Amortized Cost Basis | 65 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CorporateAndAssetBackedMember |  | 65 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CorporateAndAssetBackedMember |
Fair Value | 65 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CorporateAndAssetBackedMember |  | 67 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CorporateAndAssetBackedMember |
Common Stock and Warrants [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Unrealized Gain/(Loss) | 16 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CommonStockAndWarrantsMember |  | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CommonStockAndWarrantsMember |
Amortized Cost Basis | 1 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CommonStockAndWarrantsMember | [1] | 1 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CommonStockAndWarrantsMember | [1]
Fair Value | 17 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CommonStockAndWarrantsMember |  | 1 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CommonStockAndWarrantsMember |
Cumulative Other-than-Temporary Impairment Loss | $ 2 tsn_CumulativeOtherthanTemporaryImpairmentLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CommonStockAndWarrantsMember |  | $ 2 tsn_CumulativeOtherthanTemporaryImpairmentLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tsn_CommonStockAndWarrantsMember |
[1] | At December 27, 2014 and September 27, 2014, the amortized cost basis for Equity Securities had been reduced by accumulated other than temporary impairment of approximately $2 million.

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