Fair Value Measurements Fair Value Measurements (Narrative) (Details) $ in Millions		3 Months Ended			12 Months Ended
		Oct. 03, 2015 USD ($)	Sep. 27, 2014 USD ($)	Jun. 28, 2014 USD ($) Facilities	Oct. 03, 2015 USD ($)	Sep. 27, 2014 USD ($) Facilities	Sep. 28, 2013 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent					$ 0
Asset Impairment Charges					285	$ 107	$ 74
Goodwill, Impairment Loss					$ 23	$ 5
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Wal-Mart Stores, Inc. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Concentration, Percentage					20.00%	18.60%
Beef [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Impairment Loss					$ 0	$ 0
Prepared Foods [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Impairment Loss					0	0
Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Impairment Loss	[1]				23	5
Chicken Production Operations in China [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, Plant and Equipment, Transfers and Changes		$ 126
Goodwill, Impairment Loss		23
Impairment of other assets		20
Chicken Production Operations in China [Member] | Cost of Sales [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		169
Chicken Production Operations in China [Member] | Cost of Sales [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		169
Other [Member] | Chicken Production Operations in Brazil [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Held-for-sale, Long Lived, Fair Value Disclosure			$ 144			144
Other [Member] | Chicken Production Operations in Brazil [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges			$ 39
Facility Closing [Member] | Operating Segments [Member] | Beef [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		12
Facility Closing [Member] | Operating Segments [Member] | Prepared Foods [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		59		$ 49		$ 52
Plants Closed | Facilities				3		3
Facility Closing [Member] | Operating Segments [Member] | Cost of Sales [Member] | Prepared Foods [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		49
Facility Closing [Member] | Operating Segments [Member] | Selling, General and Administrative Expenses [Member] | Prepared Foods [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		10
Fair Value, Measurements, Nonrecurring [Member] | Chicken Production Operations in China [Member] | Cost of Sales [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		169
Fair Value, Measurements, Nonrecurring [Member] | Other [Member] | Chicken Production Operations in Brazil [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges						$ 39
Fair Value, Measurements, Nonrecurring [Member] | Facility Closing [Member] | Operating Segments [Member] | Beef [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		12
Fair Value, Measurements, Nonrecurring [Member] | Facility Closing [Member] | Operating Segments [Member] | Prepared Foods [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		59			52
Fair Value, Measurements, Nonrecurring [Member] | Facility Closing [Member] | Operating Segments [Member] | Cost of Sales [Member] | Prepared Foods [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		49
Fair Value, Measurements, Nonrecurring [Member] | Facility Closing [Member] | Operating Segments [Member] | Selling, General and Administrative Expenses [Member] | Prepared Foods [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		$ 10
Common Stock and Warrants [Member]
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	$ 6
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					35 years

[1] Other included the goodwill from our international chicken operation.