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Fair Value Measurement (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other than Temporary Impairments, Recognized in Earnings $ 0 $ 0 $ 0 $ 0
Other than Temporary Impairment Losses, Deferred in OCI $ 0 0 $ 0 0
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     33 years  
Prepared Foods | Non-Protein Business [Member] | Sara Lee® Frozen Bakery and Van’s® businesses [Member] | Cost of Sales        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges   $ 75   $ 101