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Pensions And Other Postretirement Benefits (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 27, 2020
USD ($)
Mar. 28, 2020
USD ($)
Dec. 29, 2018
USD ($)
plan
Apr. 01, 2017
plan
Oct. 03, 2020
USD ($)
plan
Sep. 28, 2019
USD ($)
Sep. 29, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Terminated Plans | plan         2    
Defined contribution retirement programs, expenses recognized         $ 103 $ 97 $ 84
Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Plans | plan         6    
Number of defined benefit plans with accumulated benefit obligations in excess of plan assets         4 5  
Defined Benefit Plan, Gain from Providing Special and Contractual Termination Benefits $ 6 $ 110     $ 112    
Expected contributions to pension plans for fiscal 2021         13    
Defined benefit plans funding         $ 19 $ 13 29
Other Postretirement Benefits Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Plans | plan         8    
Assets for Plan Benefits, Defined Benefit Plan         $ 0 0  
Defined Benefit Plan, Benefit Obligation         74 77 28
Defined Benefit Pension, Fair Value of Plan Assets         0 0 0
Defined benefit plans funding         $ 4 4  
Postretirement Health Coverage [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Plans | plan         5    
Foreign Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Number of defined benefit plans | plan         1    
Defined Benefit Pension, Fair Value of Plan Assets         $ 32    
Defined Benefit Plan, Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Plans | plan         4    
Assets for Plan Benefits, Defined Benefit Plan         $ 0 0  
Defined Benefit Plan, Benefit Obligation         238 239 220
Defined Benefit Pension, Fair Value of Plan Assets         0 0 0
Defined benefit plans funding         12 12  
Defined Benefit Plan, Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Assets for Plan Benefits, Defined Benefit Plan         $ 4 16  
Defined Benefit Plan, Number of Frozen and Noncontributory Plans | plan         2    
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits     $ 19        
Accumulated benefit obligation         $ 31 1,478  
Amounts expected to be reclassified to earnings within next 12 months related to net periodic benefit cost (credit)         0    
Defined Benefit Plan, Benefit Obligation         31 1,478 1,392
Number of defined benefit plans | plan     3 2      
Defined Benefit Pension, Fair Value of Plan Assets         35 1,477 $ 1,450
Defined benefit plans funding         7 1  
Pension Fund of Local 227 [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Multiemployer Plans, Withdrawal Obligation         1    
Hillshire Hourly and Salaried Plans [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Assets for Plan Benefits, Defined Benefit Plan   $ 52     27    
Defined Benefit Plan, Benefit Obligation         $ 0    
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] | Other Postretirement Benefits Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Plans | plan         2    
Defined Benefit Plan, Benefit Obligation         $ 16    
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] | Postretirement Health Coverage [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Plans | plan         1    
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] | Postretirement Life Insurance [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Plans | plan         1    
Other Postretirement Benefit Plan, Plan Amendments [Member] | Postretirement Health Coverage [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Plans | plan         1    
Other Postretirement Benefit Plan, Plan Amendments [Member] | Maximum [Member] | Postretirement Health Coverage [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Benefit Obligation         $ 1    
Other Postretirement Benefit Plan, Hillshire and Keystone Plans [Member] | Postretirement Health Coverage [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Plans | plan         2    
Other Postretirement Benefit Plan, Heathcare Cost Trend Rates, Hillshire Plan [Member] | Postretirement Health Coverage [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Benefit Obligation         $ 8    
Healthcare cost trend rate, assumed         7.00%    
Healthcare cost trend rate, ultimate rate         4.50%    
Retail, Wholesale and Department Store International Union and Industry Pension Fund [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Multiemployer Plans, Withdrawal Obligation         $ 10 $ 15  
Other Postretirement Benefit Plan, Heathcare Cost Trend Rates, Keystone Plan [Member] | Postretirement Health Coverage [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Benefit Obligation         $ 3    
Healthcare cost trend rate, assumed         6.80%    
Healthcare cost trend rate, ultimate rate         5.00%    
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage         7.00% 36.00%  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage           61.00%  
Level 3 [Member] | Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage         93.00% 3.00%  
Cash and Cash Equivalents [Member] | Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage         100.00%